This is actually happening right now! I’m about to spend my Christmas with a cold beer in my hand and my feet on the warm sand of the beach. Just come to the south hemisphere!
@@lucasmt.2000 Have a drink for me friend down under. The suggestion of not attaching dates to celestial movement would be fine, but would've sounded crazy a generation or two ago.
Love the Australian christmas reference. People from the northern hemisphere are always amazed when I tell them christmas day is often celebrated out in the backyard with a BBQ and all the family around the pool/down the beach!
I proposed a leap year system in ninth grade that can resolve all the rounding errors in 86,400 years...until my geography teacher told me the length of a day is not consistent.
I just need to share that because of this video, I have been able to explain to the elementary kids I work with how leap year works, and they were actually interested. Thank you for making such amazing and educational videos that are so accessible.
I guess depending on which way around the error is, years divisible by 8000 should either be double leap years (with 30 days in February?) or not leap years at all? But either way, people will cross that bridge in about 6000 years
Why does everything have to be upside down here? I don't like summer! I could cook an egg on a piece of tin I left outside. And at Christmas? Gah. Heat and hot food don't go well.
+Kalani Giddey A cast iron skillet works better. Seriously, try it, leave the skillet out for a couple hours before hand, then right at the hottest part of the day, drop an egg in it. It works rather well.
We even have a 5th season down here in Melbourne called "fuck you!" Where the weather does whatever it wants, whenever it wants. I take my jacket off and put it back on about 6 times a day
What's beautiful about this is that when the pattern repeats after 400 years, there has been 365*400+97 days, which is divisible by 7, so even the the weekdays will be the same as they were 400 years prior.
You’re on the right track. But in 2020, February 29 was on a Saturday, so will the years 2048 and 2076. I wouldn’t say it repeats every 400 years. It’s every 28 years unless you cross over a century not divisible by 400. In my prior example, the years 2048, 2076, 2116, 2144, 2172, and 2212 will be the same calendar.
+ThePCguy17 Well to be fair, he said in one of his Q&A videos that he has cancelled a bunch of videos that he deemed "too boring". I would imagine that as this video was in February 2012, he was planning a Leap Second video for June 2012, but ended up cancelling it altogether because one extra second isn't all that interesting, while a whole extra day is interesting.
Gregorian calendar is more accurate than the Julian calendar but not more accurate than the Hebrew calendar or the Chinese calendar. Out of these only the Chinese one is a true lunisolar calendar but I‘d say it still needs a little something to make it a lot more accurate. The worst calendar is actually the Muslim calendar where there are no leap [intercalary (from Latin intercalārius meaning "to insert" which the definition is based on the ancient Greek word εμβολισμος.) or embolismic [from French embolismique (Huh?! This is either a joke or a mistranslation.) via Greek εμβολισμος, "embolismos" from εμβολλειν, "embollein" meaning "to insert": β was a /b/ sound as in "boy" in ancient Greek, which is a /v/ sound as in "voice" in Modern Greek. σ is the "regular sigma" which is placed in the beginning or middle of words; ς is the "final sigma" which is only used at the end of a word instead of σ in Greek.)] days or leap months to make up the discrepancy in relation between the solar and lunar calendars and no way to add other things to sync the seasons.
Hmm... He's talking about yearly math... He made a Starcraft reference at 0:36... He used some oddly familiar symbols at 1:20... And he made a Warcraft reference at 3:04... CGP... Are you... Are you a... a- Nerd‽
I apologize for replying to a comment you've probably already forgotten about, but that interrobang at the end literally just made my day. And your profile picture. Good day to you, fine sir :)
I've always been a fan of the 28-day month, 13-month per year calendar, with a 5 (or 6 for leap year) day new-year's holiday. This calendar also moves the beginning of the year back where it should be, the Vernal Equinox.
While trying to pause the video when the word "Huzzah!" was on the screen, I discovered a neat little Easter Egg. Now I will be forever stuck with pony videos clogging up my recommended videos.
@@weapoolx182 A multiverse is a collection of universes. Multiverse means multiples "verses" (Basically just a big place with things) and a universe means one"verse" so having a multiverse necessitates multiple universes.
@@morthostalisint1720 There was no need for your "lesson" about the difference between universe 'n multiverse.. Everybody understands it with a jot of brains! However, thanks for your clarification. ;)
For my D&D game we use a lunisolar calendar that always starts the month over on the first day of the full moon, and the year starts over on the first full moon following the winter solstice.
CGP Grey, you make my brain hurt, but your videos are always amazing, educational, and funny! Thank you for doing your research and making important videos entertaining. You're awesome!!!
Leap second could be sly solution for ironing out imperfections of calendar+random disturbances -- provided that its ɛ remains bellow say 1/4 of a second per year (or as low as possible). Milankovich (Milanković) presented his "reformed Julian calendar" in 1923 and it has such features. It's shame that no one mentions it in their thematic videos (neither M. Parker nor Vsauce).
I love how you put a picture of Australia in the background when you said Christmas celebrations in the summer would be crazy.... But I guess some people don't know the temperature it is over here sometimes XD
I love your videos, there absolutely great. I was wondering tho, if you could make a video explaining this whole Kony 2012 thing. I'm sure it would be quite helpful!
omgosh, we had to design a programme in c++ in class to identify leap years and I never understood why one of the requirements was that the year should be divisible by 400 and our teacher wasn't of much help either. Thanks to you I finally understood now!
Brandon Fisher Leap years coincide with campaign years giving us an additional day to be miserable, except in 2000 when we were miserable for four years.
Or, rather, our distant descendants' unavoidable doom. Even if humanity or earth life or the machines into which our descendants upload their brains survive billions of years into our future, there's no way we personally are going to.
When we get the technology we should displace mass to make the length of the year precisely 364 days. 364 is divisible by 7, and 28, so division of dates won't be an issue. And since I said precisely, if we maintain this the seasons will never drift.
xkcd's What If series covered this question pretty thoroughly here: what-if.xkcd.com/26/ Suffice it to say, speeding up the rotation of the Earth by even a single millisecond would take hundreds of massive asteroids and probably wipe out humanity. Speeding up the Earth by an entire day would probably destroy the entire crust unless we take a couple million years to finish. Either way, the extinction of humanity probably isn't worth it.
+KTChamberlain Earth's axis will complete a rotation in 26,000 years. It has already completed 13,000 years. Currenty, earth 's axis is pointing towards polaris star. After 13,000 years, one rotation of axis will be completed and earth's axis will be pointed towards Vega star and our seasons will be flipped.
0:57 That's how we celebrate Christmas here in Chile (and in the rest of the Southern Hemisphere). It just seems crazy to the creator of this video because he lives in the other side of the world.
My question has always been: Why have 4 months with 31 days only to have a 28/29 day february? Why not take a day off two of those 31 day months and give them to february. Thus 2 months always have 31 days. 9 months always have 30 days, and february changes between the two. Instead of two completely different values.
While it would make sense to do something like this and many new calendar systems that rearrange months and weeks have been proposed, including some that would make a week either 5 or 10 days, everything is pretty much situated on the calendar we have now and everyone has pretty much decided that the amount of confusion involved in changing things like birthdates, anniversaries, and holidays (especially religious ones like weekly sabbaths) would be more difficult than simply having a weirdly numbered month in the late winter.
Because the Romans were annoying. January and February were originally the last two months of the year (which is why February is the short month, and also why SEPTember, OCTober, NOVember, and DECember have names meaning 7, 8, 9, and 10 despite currently being the 9th, 10th, 11th, and 12th months). February also used to have 29 days (30 on leap years). However, when the month of Sextilus (which had 30 days) was renamed Augustus in honor of Caesar, it was decided that it couldn't have fewer days than the month named after Julius (which had 31) days, so they stole a day from Februarius and put it onto Augustus. This is also why you have two months in a row with 31 days.
I love the Warcraft 3 reference. You have to be old school to get that. Also, observant; being observant helps too. If you didn't catch it, 3:05 in the bottom left corner.
2:57 Well, no. The calendar drift has nothing to do with our measurement techniques. It's not a technological problem that you can science your way out of. As long as humans are living on earth, we will have to deal with it. And so leap years will continue to exist.
The World Calendar was almost adopted after WWII but unfortunately lost due to social inertia. In this calendar *every quarter* of three months is identical, year after year, world without end. This is accomplished by inserting an extra day between weekdays every year and two on leap years. Four 91-day quarters add up to 364 days or exactly 52 weeks, and simply slipping in an extra World Day when needed keeps the calendar the same every year. Identical quarters also make it easier to compare business activity from one quarter to the next. There is a World Calendar association which thinks it owns this idea, as I found out when trying to suggest changes in some of the details, but humans just love to form their little empires, don't they? My biggest suggestion was to have the year start on the northern hemisphere solstice instead of ten days *after* the solstice, which it does now. My other suggestion was to count the months in a quarter by 30, 30 and 31 days instead of 31, 30 and 30. Why? Because then you could express a date by a simple three-digit number, the quarter number from 1 to 4 followed by the day number from 1 to 91, 92 (for December) or 93 in leap years. The months would be obvious as they would start on days 1, 31 and 61 every time, and so would the days of the week after a while. And figuring out days between dates would be trivial!
"that refuses to be divided nicely" except by 13 with just a solitary New Year's Day left over! i realize that this is almost never going to happen now because of how incredibly disruptive it would be to the everything, but if i had the opportunity to design the calendar system from scratch, i'd make it thirteen 28-day months with a monthless New Year's and Leap Day tacked on at the end/beginning. you could even keep seven-day weeks and days would land on the exact same dates every month. while having the New Year's and Leap Days also be "dayless" would certainly be in keeping with the tidiness of the system (so that you could reuse the exact same calendar every single year), i can also see the appeal of the days getting offset by 1 each year just for a bit of variety. with the inclusion of the Leap Year day, now i kinda want to crunch the numbers now to see how long before days land on the same date again in this system... or how long the whole cycle takes to repeat...
Alright before i watch the video, ima say what others have told me, even though it is very likely *wrong*. *a leap year adds and extra day because every year is not 365 days, but 365.25 days. so that means that every four years it would add up to 367 days.*
Sorry to correct, but to be even more precise, it's 365,24, and then even more numbers. This comment is not supposed to be offensive or rude, but to help others.
Because for the Romans it was an important month (purification) and when Caesar decided to change the calendar from a lunar one(28 days per month) to a solar one(30 days per month but adding 1 day more to some months) he decided to let february with 28 and use it as the month where a day would be added in leap years(they already added days to keep in sync with the seasons, the problem was that it wasnt something automatic but the job of the Pontifex Maximus (Caesar all that time) but if for some years he wasnt able to do so (like in the Roman civil war) then all the calendar went downhill very quickly
Ok so if i donate to NASA then I WON'T die in a fiery Apocalypse? .....but the new iphone 6s did just come out....oh well at least if i burn, i'll burn in style!
Whoops, meant warcraft. I've put hundreds of hours into both games, but I just recently got the new starcraft, so that was on my mind at the time lol. I had been living on Brood Wars for SC until now. :P
Why can't we have one calendar for every year? Hear me out! Just have the last day of the year last longer and even if you use the leap year system have the extra day at the end of the year instead of February. Then make January 1st start on a Thursday every year regardless of what day of the week the year ended. Why Thursday, so we can have a long new years holiday and back to work come Monday.
A day is 24 hours long because that's the time it takes to make one rotation. If the last day is made 30 hours long, it might help keep the seasons in sync, but your day/night cycle will keep getting shifted by 6 hours each year before it syncs again after 4 years.... hope I am making sense... :)
jackrussel13 Take away making the last day longer part. Just put the leap days at the end of the year and start the year on the same weekday is still a good idea.
For the Romans, the founders of our chalendar, the year originally ended with February (count it, September was originally the seventh month (septem = seven), October the eigth (octo = eight), November the ninth (novem = nine), and December the tenth (decim = ten)). So the leap day actually was added at the end of the year. The calendar was shifted because of the roman law, that said that gouvernors of all areas of the Roman empire (back then not yet an empire) had to come to Rome to account for their actions (and also elections, I think). The chalendar was shifted to make it easier for the gouvernors to travel. The Mare Internum isn't a place you want to be in the middle of around end February-begin March, it's stormy and dangerous. December on the other hand, gives you a relatively calm sea to sail on. This change in chalendar was just Roman problem-solving.
There is a proposal that's been floating around for awhile that is similar to this. It is called the World Calendar. It is set up so that each quarter year, the first month has 31 days, and the other two 30 days. In the middle of the year, between June and July, there would be a day with no numerical date or month, which isn't part of any week, called "World's Day". On years where we need a leap day, you add another similar "World's Day" to the end of the year. The benefit of this calendar is that every particular date always falls on the same day of the week, every month always starts on a particular day of the week etc. Of course, a lot of people don't like the idea of having days that aren't part of a week, it can screw up a lot of things, so the idea hasn't really caught on.
@@samd2612 china made a really large hydroelectric dam which stopped the flow of a relaly big river which slowed the rotation of the earth by a few milleseconds
haha I never knew about that crazy rules. I knew why there is a leap year but I really though they just left it at that :) God damn calendar designers, I have much more respect for them now.
looks like the Defense of the Ancients Pudge (basically the master of disaster), but i would rather have seen anti-mage, why? because one of his sentences in DotA 2 is: "Magic is an abomination." hoped i helped
Dagon Nemo saim qasim This in the corner is literally an "Abomination", that's the WC3 units name that Pudge is based of. Let me guess you are not older then 20?
What I've never understood about this is, how do we tell exactly how long it takes to go around the sun? Does the sun have reliable landmarks to compare against?
There are! And those are... normal landmarks. You just track the position of the rising sun on the horizon - as the year goes on, this will drift, coming back at its original position in about 365.25 days. This has been known since before even writing - as you may know, Stonehenge (dating all the way back to 3000 BCE) has a stone aligned with the sunrise on the summer solstice.
Yes, these are called equinox and solstice. Equinox marks the position in which daylight lasts exactly 12 hours, while solstice marks the position with either shortest or longest daylight.
@@kabouterwesley83 equinoxes are the days with (almost) equal day and night. the vernal equinox (spring) usually occurs on march 20 in the northern hemisphere, and in september 22 in the southern hemisphere, the autumnal equinox (fall/autumn) has the same dates, but reverse the hemispheres. solstices, however, are the days with most and least daylight. the summer solstice usually occurs on june 21 for the northern hemisphere, and december 21 for the southern hemisphere, reverse the dates for winter.
Nice video. I just wanted to point out that 1 day isn't equal to one rotation of the Earth around its axis (360 degrees). Since the Earth goes around the Sun once a year (that's 365 days), and the Earth spins in the same direction around itself and around the Sun, then 365 days equals to 366 rotations of the Earth (or 367 in a leap year). So, for the Sun to shine right above the same spot on the Earth after one night, the Earth must rotate 360.98 degrees.
+Federico Manuel Aroca Echauri That depends on what kind of day you're talking about. For example, the day you've just described (the 360.98 degrees rotation) is called a solar day, and the rotation around it's axis is called a stellar day.
"A calendar year is made of 365 days, a number that refuses to be divided nicely" 365 = 10*36.5 so how about 10 months, alternating between 36 and 37 days?
+TomLuTon Fun fact: According to Egyptian mythology, the year originally had 360 years until... ehm... long story short, the god Thoth gambled with the moon god to win enough moonlight for 5 extra days, and that way managed to make a loophole in a curse that was in effect "all 360 days of the year". (Which by the way is also the reason why the moon doesn't have enough light to be a full moon every night) If Thoth hadn't done that, it would be heaven for calendar makers. 360 is super easy to divide up into nice even months. You could have 6 months of 60 days, or 8 of 45, or 9 of 40, 10 of 36, 12 of 30, 15 of 24, 18 of 20... The possibilities are endless*! * not actually endless
Which months should we get rid of? I vote January and April because nothing really happens. (Sorry if your fav months are Jan. and Apr., they just don't really appeal to me)
Lessoned learned: Give money to Nasa organisations or we're guaranteed to be fucked by our Sun. Noted. Already knew but still we should really get on that.
It would be cool to have the seasons flip - your grandparents might be like "back in my day we celebrated Christmas in the winter!"
Grandpartents would probably be dead too
So just the other hemisphere?
This is actually happening right now! I’m about to spend my Christmas with a cold beer in my hand and my feet on the warm sand of the beach. Just come to the south hemisphere!
@@lucasmt.2000 Have a drink for me friend down under.
The suggestion of not attaching dates to celestial movement would be fine, but would've sounded crazy a generation or two ago.
Answer is no because the earths axis will change because in winter the earth is closer to the sun it will be reversed
Love the Australian christmas reference. People from the northern hemisphere are always amazed when I tell them christmas day is often celebrated out in the backyard with a BBQ and all the family around the pool/down the beach!
Same here.
Fuck yeah straya ahah! :D
MrWafu really? That's crazy!
MrWafu IF we did that in Canada, we'd freeze in the dark.
And drinking white wine in the sun?
Q: What is a leap year?
A: The sun's going to kill us all.
The surface is now safe and everything is beautiful, come out and see the SUN...
The sun is a deadly lazer
Ummm
@@dimanyak373 I love this dude
@@dimanyak373 not anymore there is a blanket
I proposed a leap year system in ninth grade that can resolve all the rounding errors in 86,400 years...until my geography teacher told me the length of a day is not consistent.
What was your idea
@@vinaylalwani i thought geology was a science class
I'm in ninth grade and what kind of ninth grade are you in? The supper elite kids full of 300 iq people?
@@blackfalcon1324 geology and geography are different things
@@johnthoppil7308 for a 9th grader geology falls inside the category of geography. Same for any high schooler
I just need to share that because of this video, I have been able to explain to the elementary kids I work with how leap year works, and they were actually interested.
Thank you for making such amazing and educational videos that are so accessible.
I Think every 8000 years it should be a double leap year.
perfect 😂😂
love it
you mean it should be a leap year since 8000 can be divided by 4.
but 8000 can be divided by 400 so it is a leap year
I guess depending on which way around the error is, years divisible by 8000 should either be double leap years (with 30 days in February?) or not leap years at all?
But either way, people will cross that bridge in about 6000 years
Yea! When I legally turn 8000 I want my leap year age to be ~2000! Lol
"Xmas celebrations in summer".
Welcome to the Southern hemisphere.
Why does everything have to be upside down here? I don't like summer! I could cook an egg on a piece of tin I left outside. And at Christmas? Gah. Heat and hot food don't go well.
"It's crazy, (points at Australia*)"
+Kalani Giddey A cast iron skillet works better.
Seriously, try it, leave the skillet out for a couple hours before hand, then right at the hottest part of the day, drop an egg in it. It works rather well.
+AFGNCAAP Paradigm sure does. But it's more fun on a piece of tin.
We even have a 5th season down here in Melbourne called "fuck you!" Where the weather does whatever it wants, whenever it wants. I take my jacket off and put it back on about 6 times a day
I love this format. Trivia in small packets. Easy to digest and make you look forward to the next.
What's beautiful about this is that when the pattern repeats after 400 years, there has been 365*400+97 days, which is divisible by 7, so even the the weekdays will be the same as they were 400 years prior.
Do you know the the doomsday method of calculating the weekdays?
svommams566 In the Julian calendar, you had to wait 700 years for the same result, I believe.
Tubmaster 5000: well, actually 28, but the first multiple thereof that's a century is 700
You’re on the right track. But in 2020, February 29 was on a Saturday, so will the years 2048 and 2076. I wouldn’t say it repeats every 400 years. It’s every 28 years unless you cross over a century not divisible by 400. In my prior example, the years 2048, 2076, 2116, 2144, 2172, and 2212 will be the same calendar.
@@heronimousbrapson863 in the julian calendar it was only 28 years
Hello from 2024 (leap year) See you all again in 2028!
CGP Grey, why are you the best at explaining things I never knew I was interested in? You're awesome :)
And then there's leap seconds.
+Russell Nelson He goes over the cause, but didn't mention them. Brain fry, perhaps.
+ThePCguy17 Well to be fair, he said in one of his Q&A videos that he has cancelled a bunch of videos that he deemed "too boring". I would imagine that as this video was in February 2012, he was planning a Leap Second video for June 2012, but ended up cancelling it altogether because one extra second isn't all that interesting, while a whole extra day is interesting.
TheKyleDavid Yeah, that's also possible, isn't it?
Gregorian calendar is more accurate than the Julian calendar but not more accurate than the Hebrew calendar or the Chinese calendar. Out of these only the Chinese one is a true lunisolar calendar but I‘d say it still needs a little something to make it a lot more accurate. The worst calendar is actually the Muslim calendar where there are no leap [intercalary (from Latin intercalārius meaning "to insert" which the definition is based on the ancient Greek word εμβολισμος.) or embolismic [from French embolismique (Huh?! This is either a joke or a mistranslation.) via Greek εμβολισμος, "embolismos" from εμβολλειν, "embollein" meaning "to insert": β was a /b/ sound as in "boy" in ancient Greek, which is a /v/ sound as in "voice" in Modern Greek. σ is the "regular sigma" which is placed in the beginning or middle of words; ς is the "final sigma" which is only used at the end of a word instead of σ in Greek.)] days or leap months to make up the discrepancy in relation between the solar and lunar calendars and no way to add other things to sync the seasons.
Years! Seconds are just 11:60 AM/PM for 1 second.
Hmm... He's talking about yearly math... He made a Starcraft reference at 0:36... He used some oddly familiar symbols at 1:20... And he made a Warcraft reference at 3:04...
CGP... Are you... Are you a... a-
Nerd‽
I apologize for replying to a comment you've probably already forgotten about, but that interrobang at the end literally just made my day. And your profile picture. Good day to you, fine sir :)
I don't forget about comments! :3 Thanks for the compliment!
***** "Some oddly familiar symbols" haha :P
also creeper at 1:41 and annotation at 2:11 and probably so many other hidden things
DoLoyalty Damn you, CGP! You made me click on a pony video! Sarcasam aside, that was a good one, though.
***** No, that's ridiculous! Next thing you know, you'll be saying that bullfrogs aren't part bull.
Thanks, youtube, for recommending this on March 1st, 2020.
I've always been a fan of the 28-day month, 13-month per year calendar, with a 5 (or 6 for leap year) day new-year's holiday. This calendar also moves the beginning of the year back where it should be, the Vernal Equinox.
1:19 Luna is best Princess.
2:09 Huzzah! The fun has been doubled.
IKR I just commented i know MY LITTLE PONY
Pls tell me the reference
I played the video at lowest speed and still didn't saw anything
@@scarletpachyderm I understand that too
While trying to pause the video when the word "Huzzah!" was on the screen, I discovered a neat little Easter Egg. Now I will be forever stuck with pony videos clogging up my recommended videos.
***** That was a joke. I know how to delete videos from my watch history.
I think I'm missing something. What easter egg?
Bel-Shamharoth Read the rest of the comments. Sorry for the 2 month late response.
+Tommy Dee I got it. I normally watch with annotations off so that's why I didn't see it.
+Tommy Dee i don't even have my history turned on what?
Wow, old cgp grey videos hit different
The universe is such a troll.
AFGNCAAP Paradigm shrekted
@Quantum Paradoxigm There is no Universe, but a Multiverse.
@@weapoolx182 A multiverse is a collection of universes. Multiverse means multiples "verses" (Basically just a big place with things) and a universe means one"verse" so having a multiverse necessitates multiple universes.
@@morthostalisint1720 There was no need for your "lesson" about the difference between universe 'n multiverse.. Everybody understands it with a jot of brains! However, thanks for your clarification. ;)
@@presidentialcampaignmusic1018 Exactly! I knew what he'd answer. I'm kinda a psychic lol
For my D&D game we use a lunisolar calendar that always starts the month over on the first day of the full moon, and the year starts over on the first full moon following the winter solstice.
Something as complicated as a leap year definitely needed an explanation! Thank you so much!
You think secular leap years are complicated, look at Jewish leap years, just a whole extra month added at what seems like random intervals
"Unless we have a decently funded space program, hint, hint!"
OMG YES! Thanks grey!
Why not privatize
CGP Grey, you make my brain hurt, but your videos are always amazing, educational, and funny! Thank you for doing your research and making important videos entertaining. You're awesome!!!
Leap second could be sly solution for ironing out imperfections of calendar+random disturbances -- provided that its ɛ remains bellow say 1/4 of a second per year (or as low as possible). Milankovich (Milanković) presented his "reformed Julian calendar" in 1923 and it has such features. It's shame that no one mentions it in their thematic videos (neither M. Parker nor Vsauce).
Thumbs up for the Warcraft 3 Abomination reference at 3:04
I saw that :D
Oh i saw it as pudge from dota lol
Your constant Starcraft and MLP references make me smile like a loon every time. Thanks for making my day.
1:40 Creeper in the back of the car.
nice spot!
Thomas Moulden your right didn't even notice it
didnt notice that!
Didn’t notice that ,,,
......
The fact that this was uploaded on Feb. 28th and not Feb 29th, although the upload year was leap year.
“Christmas will be taking place in summer”
Southern Hemisphere:
or phineas and ferb's world lol
@@FewVidsJustComments Doofenshmirtz hit this reply with a delay-inator and made the reply a year late.
@@CCABPSacsach ah, I see you are a fan of Phineas and Ferb as well. glad to see im not the only one who still likes it even years after it ended.
I love how you put a picture of Australia in the background when you said Christmas celebrations in the summer would be crazy.... But I guess some people don't know the temperature it is over here sometimes XD
Potato
@@JacobBongers Potato
I love how Grey makes this stuff interesting
I had a client once whose birthday was on february 29th. Rare bird
I love your videos, there absolutely great. I was wondering tho, if you could make a video explaining this whole Kony 2012 thing. I'm sure it would be quite helpful!
0:58 here in south america chistmas IS on summer
Good on you for catching his joke.
The day has finally come once again. Happy Leap Day everyone!
Sure Has!
omgosh, we had to design a programme in c++ in class to identify leap years and I never understood why one of the requirements was that the year should be divisible by 400 and our teacher wasn't of much help either. Thanks to you I finally understood now!
I can't believe another leap year (2016) is already here! Was the last leap year (2012) already 4 years ago?
Brandon Fisher
Leap years coincide with campaign years giving us an additional day to be miserable, except in 2000 when we were miserable for four years.
@Sean Hiseman The Leap Years are always doomed. 😉
euewheuef it 2020 now
@@doyoungod8212 True, 2020 now makes 2016 4 years ago and 2012 8 years ago.
Message of this not quite 4 minute long video:
Donate to NASA to avoid your unavoidable fiery doom.
Or, rather, our distant descendants' unavoidable doom. Even if humanity or earth life or the machines into which our descendants upload their brains survive billions of years into our future, there's no way we personally are going to.
As a half brit I'm going to do what my ancestors do: just let it be your descendants problem
When we get the technology we should displace mass to make the length of the year precisely 364 days. 364 is divisible by 7, and 28, so division of dates won't be an issue. And since I said precisely, if we maintain this the seasons will never drift.
And what are we gonna do with drifting days?
Redefine hour or get some funny looking watches?
Commie Jesus Redefine the hour.
Let's hope no one smart enough to come up with the technology is stupid enough to try and use it.
Blood Angel What's wrong with this? I think it's a good idea to do.
xkcd's What If series covered this question pretty thoroughly here: what-if.xkcd.com/26/
Suffice it to say, speeding up the rotation of the Earth by even a single millisecond would take hundreds of massive asteroids and probably wipe out humanity. Speeding up the Earth by an entire day would probably destroy the entire crust unless we take a couple million years to finish. Either way, the extinction of humanity probably isn't worth it.
Saturday February 29th, 2020, good Leap Day to everyone.
Old Grey is still "cool" Grey in my book! These "tiny nugget of info" videos are awesome! 🤩
When you say few hundred years the seasons would be flipped, just out of curiosity, how many hundred years would that be?
***** thank you.
***** A quarter of a day per year moves the seasons 182 days in about 780 years.
+SoloNita Technically 0 AD doesn't exist. They hadn't invented zero yet.
+KTChamberlain Earth's axis will complete a rotation in 26,000 years. It has already completed 13,000 years. Currenty, earth 's axis is pointing towards polaris star. After 13,000 years, one rotation of axis will be completed and earth's axis will be pointed towards Vega star and our seasons will be flipped.
Not the"Earth's axis" but rather a "precession cycle". And what is your criteria for saying we're 13,000 years into a cycle?
Anyone notice there s a creeper hidden in most of the photos? Like at 1:34 he's in the back of the black car :)
yeah I noticed that and was about to comment it
Wait, I thought creepers hated cats?
David Hong But dis creeper's a badass.
Yeah, i noticed that too. LOL
tssssssssssssssssssssssssssss...BOOOOOOOOOOOOOOOOOOOOOOOOOOOOM
The ballerina on the truck explanation is the most elegant I've ever seen.
Did he just make a My Little Pony reference at 1:19?
Yes, he did.
And at 1:33, there’s a creeper in the background car.
This video is full of references.
+John Sheppard On his article about the problem with television news, one of his subheaders is "Dear Princess Celestia, I didn't learn anything!"
Princess Molestia Thank you Molly
Yes
My little pony I use to wonder what friendship was my little pony, until you all shared it’s magic with ME
@@iykury ok
AGRICULTURAL REVOLUTION ON CRASH COURSE! HAHA! I have no clue why I find that so exciting.
Today is Feb 29, 2020. I'll be back in 2024 to see how old my comment is. 1 year or 4 years.
I want to see that happen so don't mind me, just preparing :)
yEe
.
Iam Also waiting
My birthday is 29 February 1988
0:57 That's how we celebrate Christmas here in Chile (and in the rest of the Southern Hemisphere). It just seems crazy to the creator of this video because he lives in the other side of the world.
I love the tiny references, like the abomination from Warcraft 3 :D
i literally just noticed that and was finding the comment on it
CREEEPER!
Evan Barrie at 1:41
1:19 Lovin' the reference.
"1 2 skip a few 99 100!" -Yacko, Animaniacs
currently in a never ending loop between minute physics video and cgp greys video. Its what they would have wanted
0:36 Nice StarCraft reference.
in Australia it is summer when it is Christmas. Some people have BBQ's on the beach wearing Christmas hats
ye m8
notin' lik e 4ey degreyze dai' on ya beech wit ye crismus' hat
What?
let me try to translate:
Yea mate. Nothing like a 40 degrees day the beach with your Christmas hat
BAM!
LOL. Genius!
My question has always been: Why have 4 months with 31 days only to have a 28/29 day february? Why not take a day off two of those 31 day months and give them to february. Thus 2 months always have 31 days. 9 months always have 30 days, and february changes between the two. Instead of two completely different values.
Because you still get the same leap year problem.. Also, its impractical to change so many people's birthmonths.
While it would make sense to do something like this and many new calendar systems that rearrange months and weeks have been proposed, including some that would make a week either 5 or 10 days, everything is pretty much situated on the calendar we have now and everyone has pretty much decided that the amount of confusion involved in changing things like birthdates, anniversaries, and holidays (especially religious ones like weekly sabbaths) would be more difficult than simply having a weirdly numbered month in the late winter.
Because the Romans were annoying. January and February were originally the last two months of the year (which is why February is the short month, and also why SEPTember, OCTober, NOVember, and DECember have names meaning 7, 8, 9, and 10 despite currently being the 9th, 10th, 11th, and 12th months). February also used to have 29 days (30 on leap years). However, when the month of Sextilus (which had 30 days) was renamed Augustus in honor of Caesar, it was decided that it couldn't have fewer days than the month named after Julius (which had 31) days, so they stole a day from Februarius and put it onto Augustus. This is also why you have two months in a row with 31 days.
Because that would require a bunch if countries agreeing on something
3:05 "an abomination", nice Warcraft III reference in the bottom left corner!
Luna and Celestia Sun and Moon at 1:20 ???
True.
Also, clicking "Huzzah" at 2:10...
Eeyup.
Same! XD
My birthday being on leap day is so confusing
2:50 I see what you did there.
I love the Warcraft 3 reference. You have to be old school to get that. Also, observant; being observant helps too. If you didn't catch it, 3:05 in the bottom left corner.
2:57 Well, no. The calendar drift has nothing to do with our measurement techniques. It's not a technological problem that you can science your way out of. As long as humans are living on earth, we will have to deal with it. And so leap years will continue to exist.
The World Calendar was almost adopted after WWII but unfortunately lost due to social inertia. In this calendar *every quarter* of three months is identical, year after year, world without end. This is accomplished by inserting an extra day between weekdays every year and two on leap years. Four 91-day quarters add up to 364 days or exactly 52 weeks, and simply slipping in an extra World Day when needed keeps the calendar the same every year. Identical quarters also make it easier to compare business activity from one quarter to the next.
There is a World Calendar association which thinks it owns this idea, as I found out when trying to suggest changes in some of the details, but humans just love to form their little empires, don't they? My biggest suggestion was to have the year start on the northern hemisphere solstice instead of ten days *after* the solstice, which it does now. My other suggestion was to count the months in a quarter by 30, 30 and 31 days instead of 31, 30 and 30. Why? Because then you could express a date by a simple three-digit number, the quarter number from 1 to 4 followed by the day number from 1 to 91, 92 (for December) or 93 in leap years. The months would be obvious as they would start on days 1, 31 and 61 every time, and so would the days of the week after a while. And figuring out days between dates would be trivial!
amazing!!!
yeah!
Once again, a fantastic video.
100 Days of Code challenge. Life if that's the reason you're here.
Time is an illusion. Lunch time, doubly so.
Tomorrow is leap day!
+RainTeamTrain I am, still none the wiser, Happy Leap Year Day
"that refuses to be divided nicely" except by 13 with just a solitary New Year's Day left over! i realize that this is almost never going to happen now because of how incredibly disruptive it would be to the everything, but if i had the opportunity to design the calendar system from scratch, i'd make it thirteen 28-day months with a monthless New Year's and Leap Day tacked on at the end/beginning. you could even keep seven-day weeks and days would land on the exact same dates every month. while having the New Year's and Leap Days also be "dayless" would certainly be in keeping with the tidiness of the system (so that you could reuse the exact same calendar every single year), i can also see the appeal of the days getting offset by 1 each year just for a bit of variety. with the inclusion of the Leap Year day, now i kinda want to crunch the numbers now to see how long before days land on the same date again in this system... or how long the whole cycle takes to repeat...
we all know the python course 😂
"Christmas in the summer?? The hell??"
Southern Hemisphere people: -_-
Leap day 2020 yay!
Thanks Grey for taking the time to fix your videos from the Annotation Obliteration
Alright before i watch the video, ima say what others have told me, even though it is very likely *wrong*.
*a leap year adds and extra day because every year is not 365 days, but 365.25 days. so that means that every four years it would add up to 367 days.*
Sorry, 366 i mean
+Seteiris It might be 366.25 days
Sorry to correct, but to be even more precise, it's 365,24, and then even more numbers. This comment is not supposed to be offensive or rude, but to help others.
Thanks for the correction :D
Why does February have less days than every other month even when it’s a leap year?
Partly to make it balance as explained in the video; and partly because Julius and Augustus Caesar were egotistical prats.
Because for the Romans it was an important month (purification) and when Caesar decided to change the calendar from a lunar one(28 days per month) to a solar one(30 days per month but adding 1 day more to some months) he decided to let february with 28 and use it as the month where a day would be added in leap years(they already added days to keep in sync with the seasons, the problem was that it wasnt something automatic but the job of the Pontifex Maximus (Caesar all that time) but if for some years he wasnt able to do so (like in the Roman civil war) then all the calendar went downhill very quickly
Ok so if i donate to NASA then I WON'T die in a fiery Apocalypse? .....but the new iphone 6s did just come out....oh well at least if i burn, i'll burn in style!
Thanks for making mere facts comprehensable and fun!
Christmas in summer would be crazy.
That's how we do it in Brazil!
😢 also no snow.
lol, who saw the [warcraft]** abomination in the bottom left corner? at 3:06
WE DONE WAITING
Warcraft 3. ^^
you must construct additional pylons
...... starcraft?
Whoops, meant warcraft. I've put hundreds of hours into both games, but I just recently got the new starcraft, so that was on my mind at the time lol. I had been living on Brood Wars for SC until now. :P
Why can't we have one calendar for every year?
Hear me out!
Just have the last day of the year last longer and even if you use the leap year system have the extra day at the end of the year instead of February. Then make January 1st start on a Thursday every year regardless of what day of the week the year ended. Why Thursday, so we can have a long new years holiday and back to work come Monday.
because living one 30 hour day wouldn't be ideal
A day is 24 hours long because that's the time it takes to make one rotation. If the last day is made 30 hours long, it might help keep the seasons in sync, but your day/night cycle will keep getting shifted by 6 hours each year before it syncs again after 4 years.... hope I am making sense... :)
jackrussel13
Take away making the last day longer part.
Just put the leap days at the end of the year and start the year on the same weekday is still a good idea.
For the Romans, the founders of our chalendar, the year originally ended with February (count it, September was originally the seventh month (septem = seven), October the eigth (octo = eight), November the ninth (novem = nine), and December the tenth (decim = ten)). So the leap day actually was added at the end of the year. The calendar was shifted because of the roman law, that said that gouvernors of all areas of the Roman empire (back then not yet an empire) had to come to Rome to account for their actions (and also elections, I think). The chalendar was shifted to make it easier for the gouvernors to travel. The Mare Internum isn't a place you want to be in the middle of around end February-begin March, it's stormy and dangerous. December on the other hand, gives you a relatively calm sea to sail on. This change in chalendar was just Roman problem-solving.
There is a proposal that's been floating around for awhile that is similar to this. It is called the World Calendar. It is set up so that each quarter year, the first month has 31 days, and the other two 30 days. In the middle of the year, between June and July, there would be a day with no numerical date or month, which isn't part of any week, called "World's Day". On years where we need a leap day, you add another similar "World's Day" to the end of the year. The benefit of this calendar is that every particular date always falls on the same day of the week, every month always starts on a particular day of the week etc. Of course, a lot of people don't like the idea of having days that aren't part of a week, it can screw up a lot of things, so the idea hasn't really caught on.
Love the warcraft easter eggs and references.
1:08 “If you timed it with a stopwatch”
3:12 China's giant hydroelectric dam must've had NOOOOTHING to do with that...
Huh?
@@samd2612 china made a really large hydroelectric dam which stopped the flow of a relaly big river which slowed the rotation of the earth by a few milleseconds
haha I never knew about that crazy rules. I knew why there is a leap year but I really though they just left it at that :) God damn calendar designers, I have much more respect for them now.
I knew this but had to watch to see the CGP grey view on this
Has anyone noticed the creepers like at 1:36?!?!?
bottom left corner at 3:03 What is that?
looks like the Defense of the Ancients Pudge (basically the master of disaster), but i would rather have seen anti-mage, why? because one of his sentences in DotA 2 is: "Magic is an abomination."
hoped i helped
thanks that's been bugging me
u r welcome (most legit grammar by the way)
thank you.
Dagon Nemo saim qasim This in the corner is literally an "Abomination", that's the WC3 units name that Pudge is based of. Let me guess you are not older then 20?
1:19 Like if you recognize what that sun and moon are from
Thanks a lot for the link Angela Yu, now I am distracted and watching this guy's other videos. -_-
We have christmas in summer....
lol
Stupid is stupid. And now I am done with you. Blocking in action.
although would be fun if you could switch every few hundred years...
I'm Born on a leapday so i have celebrated 7 birthdays so far.
mlp references are the best
this video was once again suggested to me, happy 2020!!!!
What is the program beside NASA? 3:34
ESA the European Space Agency
What I've never understood about this is, how do we tell exactly how long it takes to go around the sun? Does the sun have reliable landmarks to compare against?
There are! And those are... normal landmarks.
You just track the position of the rising sun on the horizon - as the year goes on, this will drift, coming back at its original position in about 365.25 days. This has been known since before even writing - as you may know, Stonehenge (dating all the way back to 3000 BCE) has a stone aligned with the sunrise on the summer solstice.
seasons?
Yes, these are called equinox and solstice. Equinox marks the position in which daylight lasts exactly 12 hours, while solstice marks the position with either shortest or longest daylight.
@@kabouterwesley83 equinoxes are the days with (almost) equal day and night. the vernal equinox (spring) usually occurs on march 20 in the northern hemisphere, and in september 22 in the southern hemisphere, the autumnal equinox (fall/autumn) has the same dates, but reverse the hemispheres. solstices, however, are the days with most and least daylight. the summer solstice usually occurs on june 21 for the northern hemisphere, and december 21 for the southern hemisphere, reverse the dates for winter.
@@eduardoxenofonte4004 thanks. I already corrected myself. I should have known. Equi-nox is latin for equal night.
What is that in the corner at 3:04 ?
An 'Abomination' from the Warcraft series.
Richard DickInSon thanks
Nah its pudge from dota 2 :d
FpS4L Sigh... You're kidding me right?
Nice video. I just wanted to point out that 1 day isn't equal to one rotation of the Earth around its axis (360 degrees). Since the Earth goes around the Sun once a year (that's 365 days), and the Earth spins in the same direction around itself and around the Sun, then 365 days equals to 366 rotations of the Earth (or 367 in a leap year). So, for the Sun to shine right above the same spot on the Earth after one night, the Earth must rotate 360.98 degrees.
+Federico Manuel Aroca Echauri That depends on what kind of day you're talking about. For example, the day you've just described (the 360.98 degrees rotation) is called a solar day, and the rotation around it's axis is called a stellar day.
"A calendar year is made of 365 days, a number that refuses to be divided nicely"
365 = 10*36.5
so how about 10 months, alternating between 36 and 37 days?
+TomLuTon Fun fact: According to Egyptian mythology, the year originally had 360 years until... ehm... long story short, the god Thoth gambled with the moon god to win enough moonlight for 5 extra days, and that way managed to make a loophole in a curse that was in effect "all 360 days of the year". (Which by the way is also the reason why the moon doesn't have enough light to be a full moon every night)
If Thoth hadn't done that, it would be heaven for calendar makers. 360 is super easy to divide up into nice even months. You could have 6 months of 60 days, or 8 of 45, or 9 of 40, 10 of 36, 12 of 30, 15 of 24, 18 of 20... The possibilities are endless*!
* not actually endless
Because then you're not taking into account the lunar cycle which has a period closer to 30 days.
Which months should we get rid of? I vote January and April because nothing really happens. (Sorry if your fav months are Jan. and Apr., they just don't really appeal to me)
The Wisest Waffle or if someone happens to be born in those months....
Then it won't be no longer called a lunisolar calendar
Lessoned learned: Give money to Nasa organisations or we're guaranteed to be fucked by our Sun. Noted.
Already knew but still we should really get on that.
Bruh that would be funny ass hell
+Macconator2010 Did someone say "fucked by the sun?"
Princess Molestia That is correct, we'll all get impaled on the Sun's massive fiery cock via the anus.
+Macconator2010 That would be so hot
GUYS GUYS GUYS, THIS VIDEO WAS POSTED FEB 28 2012, THE DAY BEFORE THE LEAP DAY
every 9 years a youtube year is completed and a video gets recommended to every freakin person on here.