The Calendar With 13 "Friday the 13ths" Every Year
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- Опубликовано: 18 сен 2024
- Happy “Friday the 13th”! Let me show you a bunch of interesting things about calendars, including a roast of the current calendar system, a better calendar with 13 months, an explanation about "Leap Seconds", and a variety of other fun facts! To help support these videos and see behind-the-scenes content like the full uncut footage of the campfire scene from this, check out my Patreon at / comboclass (and see below in this description for the names of my awesome supporters!)
CORRECTION: Around the middle of the episode, I accidentally wrote/said (5) and (71) as the prime factorization of 365, but it's supposed to be (5) and (73). All appearances of "71" there should be "73".
Stay tuned for an episode about how to count complex numbers in Base 2i (and Base i - 1) coming later in January. In the meantime, check out the Combo Class Bonus channel @Domotro for my short videos, bonus lessons, and livestreams!
Some of the calendar topics discussed in this episode include: the phobia of the number 13 (known as triskaidekaphobia) and the more specific phobia of Friday the 13ths (known as paraskevidekatriaphobia or friggatriskaidekaphobia), the Gregorian Calendar, problems with February, ways to remember which months have 30/31 days, how Leap Days and Leap Seconds actually work, the 13-month "International Fixed Calendar", a possible 360-day calendar, my flooded classroom, how to cook an egg on a campfire, and more.
Special thanks to my Patreon supporters: Tybie Fitzhugh, Henry Spencer, Mitch Harding, YbabFlow, Plenty W, Quinn Moyer, Julius 420, Philip Rogers, Ilmori Fajt, Brandon, August Taub, Ira Sanborn, Matthew Chudleigh, Cornelis Van Der Bent, Craig Butz, Mark S, Thorbjorn M H, Mathias Ermatinger, Edward Clarke, and Christopher Masto, Joshua S, Max, Joost Doesberg, Adam, Chris Reisenbichler, Stan Seibert, Amy, and Izeck.
Patreon: / comboclass
Bonus channel: / @domotro
Reddit: / comboclass
Discord: / discord
If you're reading this, leave a comment with which calendar is your favorite!
Disclaimer: Do not copy any physical actions you see in Combo Class episodes, including any use of fire, tools, or other science experiments.
This turned out to be the longest Combo Class episode yet! Make sure to watch the whole thing for a lot of fun facts and surprises. And if you want to see the full behind-the-scenes footage from the campfire in this, check out my Patreon at www.patreon.com/comboclass
Matt Parker (standupmaths) has done a video on the misalignment you mentioned in the intro. He's said this is how he determines how good/bad a calendar is: how frequently it drifts a day relative to the seasons (i.e. the tropical year).
Here's the calculation he would do: subtract the smaller of the longterm average year and tropical year from the other, giving you the number of *days* you would drift by every year. The closer the result is to 0, the better the calendar is.
Uranusday
How about we just abolish weeks and months and zero-index days? Surely non-Americans can count up to 365, right?
I will fight for the 13 month calendar as long as I live. Never been able to internally keep track on how the days of the months line up with the days of the week. Apparently with the current system some people also talk about weeks as numbers, like I've been asked "would you like to do x on week 15?" and I've had absolutely no clue what the hell is a 'week 15'. The 13 month calendar would also make all that really simple.
May I ask: what country do you live in? I’ve never heard *anyone* refer to a day as week 15, although this is the notation used in the ISO Week calendar. Is it a regional thing, something with industry, or?
Fight for the abolishment of saying "week 15". Don't give them more of a reason to say it.
That idea of making arithmetic with time simpler is part of the reason why I use 24-hour time instead of 12-hour time
It will never happen. Biggest reason we will never have 13 months is because they would change July to sol, oh hell naw. I was born in July, you ain't taking my month away.
The earth is neither sphere nor dodecahedron, but it's clearly a gyroelongated pentagonal bipyramid, or the icosahedron for short
Ah, a fellow Vsause viewer
There is a map projection that models the earth like one, whick makes things easier to flatten
It's called the dymaxion map
@@neologicalgamer3437 I've never herd him say that, or did I?
@@potatoheadpokemario1931 every strictly convex deltahedron
@@asheep7797 that's not a Vsause video
the ancient Egyptians did something similar to the 360+5 thing! the extra 5 days we celebrated as the birthdays to some of the major gods (theres a whole myth there involving godly shenanigan) but that meant any attempt to include a leap day was met with backlash and cries of heresy so the calendar started slowly drifting out of alignment which is a pretty interesting case study on human psychology I think!
That would be superior
365 = 360+5 = (12×30)+5
If the week to be 5 days, then:
the year is 12 months of 6 weeks of 5 days with a 1 week holiday
Benefits:
Week divides month and year evenly.
Any date of the year will always fall on the same day of the week.
Say you were born on a Friday, then your birthdays will always be Friday. Nice.
All holidays have a fixed day of week.
5 is a nice divider of decimal. Way better than 7. Nicer products too. Easy to use in the head.
weeks are double one tenth of days
days are half ten times of weeks
days and weeks are easily converted to months, since weeks in months are constant.
Meanwhile, there is no exact conversion from days to months in the common calendar.
Drawbacks:
month does not divide year evenly. But hey... our week never divides our year or month evenly, except on a leap year month.
people don't like change
Update: I wrote this before hearing the end of the video where this is discussed. So 6 days a week is not ideal because the remaining days would not be a week. So there is not a perfect number of weeks in a year. 6 weeks of 5 days is better IMO.
...thus showing how religion is a cancer on society
"**When** we change to counting numbers in base-6"
I unironically love the confidence!
Base-6: better than base-12.
The last calendar proposed sounds a heck of a ton like the Egyptian calendar. Also I love 6 day weeks, let's go.
depends if you get 4 workdays and 2 weekend days, or 5 workdays and only 1 weekend day...
@@otakarbeinhauer I think a good way to do it would be to have 4 working days and 2 days off, with the working days being 8.5hrs long to compensate or 9hrs if people want to keep an integer number of hours
@@CamerTheDragon no
@@CamerTheDragon 4 hour a day
@@CamerTheDragon the 8 hour workday is already soul-crushing in a 7 day week. You're proposing making it worse. Just leave it at 8 with 2 weekend days.
I like the idea of 30-day months plus a bonus 5-day "holiday weekmonth" before the new year. 7 days a week could still work, with or without making the year-end days their own special format of day names.
The idea of having 12 months of 30 days with 5 additional holiday days scattered between is used in the fictional Forgotten Realms D&D setting. I’ve always really liked it.
I was raised with the knuckle trick and still use it when I want to remember how many days are in a month!
Me too I can't memorize things
I am a fan of the 6 day week and 30 day month, and base 6 seems way cleaner too. What still bothers me the most when it comes to dates is the time: 12am and 12pm is swapped, after 11am there shoud be either 12am or 00pm, calling it 12pm is just wrong yet the way people use it
I get the objection, but it's not actually backwards. AM/PM stand for 'ante meridiem' and post meridiem', which are latin for 'before midday' and 'after midday'. Noon is written as 12:00 PM because clearly 12:01 must be labeled PM. If you want to be super pedantic you could label noon as 12:00 M (meridiem) and midnight as 12:00 CM (contra meridiem) or maybe 12:00 MN (merinocte). I feel like CM is more in the correct spirit here than MN. The best way of course is to just forget the whole business and express time from 0000 to 2359.
@@torydavis10 but then we need a new word, I come from germany we count time from 0000 to 2359, but in english we would have to say 14 o'clock, rather than 2 "pm" and pm is easier to say than "o'clock" so what is the solution here? it's 14pm?
@@JuliusUnique what about the existing term "hundred hours' (as in 1200 - '12 hundred hours')?
@@torydavis10 or to set the midpoint to dawn instead, so the day starts with the sun (or the average time the sun rises at the equator each day). combine this with 24 perfectly split timezones where each one is identified as +x, meaning x slices to the right of true 0 (the least populated slice), then you would have the perfect worldwide time system.
"what time is it?"
"6 day, +7."
"ok thank you. so for my wife in +12, it should be 11 day, she should be off work about now."
also it is backwards, 12:01 PM directly means 12 hours and 1 minute past midday. while switching the 12's symbols would not help things, it would still be more accurate (although the numbering for am is switched, it is going from past midnight but it is identified as before midday, so the numbers get larger when they should get smaller, which would actually solve our problem for us).
the true solution to the problem without changing the clock would be changing 12 am and 12 pm to 0 am and 0 pm.
@@charlesgaskell5899 I don't like the "hundred hours" thing because there are 60 minutes in an hour and not 100 so it feels weird to hear and putting the hours bit after hundred is even more weird imo
Generally about the 12am vs 12pm thing in response to comment at the top, I'll write the time in 24 hour format but say in 12 hour format and I'll say something like "20 past midnight" for when it's near midnight, I don't do the same for noon but you could in the same way to eliminate the whole 12am vs 12pm thing
Combo Class at 2x speed is still perfectly understandable and is peak chaos.
There actually is a calendar that works pretty similarly to what you mentioned at the end, it's the French Republican Calendar! It was invented and was in use for a few years during the French Revolution, and it came from the same impetus to make measurement more "rational" that brought us the metric system and decimalized currency. The year starts on the northern autumn equinox, and it has twelve months of thirty days each followed by five (six in leap years) days called "Sansculottides", which is a reference to the attire of the common people of France. Each of the months is named after the typical weather in France at that time of year. Each month was divided into three décades, weeks of ten days each. Ultimately it failed because it disrupted the seven-day week cycle, the leap years were not well defined, and the Gregorian Calendar it was trying to replace was already standardized and good enough, while the metric system succeeded because the traditional systems of measurement were unstandardized.
You got me convinced, Domotro. I'm gonna subscribe to Dodecahedral Earth Theory from now on.
The only objection I have to the 13 month calendar is that for birthdays and other holidays, they would always fall on the same day. People born on weekends would be so much luckier than people born on weekdays since their birthday parties could always be celebrated on the day of instead of always waiting for the next weekend. At least with the misaligned calendar, everyone's birthdays fall on the weekend 2 out of every 7 years on average.
You can fix that by making "Year Day" a standard day of the week; every year the calendar will shift by exactly one day. You can keep "Leap Day" as a non-day, or include it too to match the current Gregorian calendar (in terms of how birthdays line up with days of the week).
That just means you need to replace birthdays with birthweeks.
Kind of takes the personal aspect out of it though. You’ll be competing with 7 times as many people for attention, whereas in the current system, you get a good day of the week every 3.5ish years. Less often, but more special.
you could fix that by celebrating birthday every 364th day or something.. :D
Instead of 13 months of 28 (4*7) days, what if we do 7 months of 52 (4*13) days? I propose: The "7 Decks of Cards" calendar!
* There will now be 7 months of 52 days, but months will be renamed "Decks"
* There will still be 4 weeks in the month but weeks will now be 13 days long. (One day for each card, one week for each suit)
* Each of these weeks will be named after a suit of cards (clubs, diamonds, hearts, spades)
* Each day of the week will be named after a card (so the week will begin on the ace, then 2, 3, 4, until finally Jack, Queen, King)
* To stop these 13-day weeks from feeling too long we'll treat them as two half-weeks of unequal length: A half-week of 7 days (Ace to 7) and a half-week of 6 days (8 to King). Each half week will have two "weekend days" so every other half-week will be a 4-day week. Pretty cool right?
* The one or two extra days needed to make the year 365 or 366 days long will be the Jokers. Normal years will just have the red joker; leap years will have both the red and black jokers. These will come at the end of the year and will not be part of any deck (month)
* So now, for instance, March 1st on a normal year will be "The 8 of Spades in the Second Deck".
How about that for a calendar?
As long as you make sure that Valentine's Day is in the week of hearts I'd almost be ok with this.
How about 14 26-day months. Each day can be a letter of the alphabet written in one of 14 fonts. For year day we use a period, since it’s not associated with a month, it doesn’t matter that it looks the same in most fonts. Leap day can be the comma or semicolon.
This would leave us with 2 13-day weeks per month, which is kind of awkward.
@@cameron7374 Traditionally, it would be the 45th day of the year, which puts it at the 6th day of the 4th 13-day week. If we push it 4 days earlier, we could make it the 2 of hearts.
@@cameron7374 So it would be the 6 of hearts in the 1st deck if hearts come last.
Great episode. I did something similar a couple of years back where I attempted to creat a 13 month calendar, because I found the 30/31 day months annoying. Here’s some additional things I spotted:
The reason Sept - Dec don’t mTch with the numbers 7-10 is actually because two new months were added in the middle to the original Roman calendar, named after the Roman emperors Julius (July) and Augustus (August)
I also though that the additional day each year should be on the winter solstice which would be the best candidate for a ‘new year’ marker as it is the day that the earth starts tilting back the other way. (Granted, this makes more sense to the northern hemisphere. The southerners would instead enjoy this for their longest day of the year!) This special day could be an international holiday (combining new years/solstice and religious festivals like Christmas Day which is super close).
The four yearly leap day could be on the opposite solstice.
I also saw the connection with the lunar month (which I thought you might mention!) as we get a new moon roughly every 28 days which would correlate with an International Fixed Calendar. (Almost at least!)
HOWEVER I think the real reason most people would have a problem with an International Fixed Calendar is because, if you’re not lucky to have been born on a weekend, you will NEVER get a birthday on a weekend! 😱
July and August were not added - they were renamed from Quintilis (the month in which Julius Caesar was born) and Sextillis. At this point they were already the seventh and eighth month, because January and February had been moved from the end of the year (which is why we add leap days to February) to the beginning.
We used to start the year on the spring equinox, and the current UK tax year is a result of that (when we adopted the Gregorian calendar, we skipped ten days - the date of the tax year was pushed back by ten days to compensate).
The birthday problem can be solved by making Year Day an actual day of the week, so the calendar shifts by exactly one day each year, but the IFC doesn't do that unfortunately.
Nice. I didn’t realise that about July and August. Thanks for that. Nice idea about Leap Day being an actual day, to solve the weekend birthday problem, though I do like the idea of it being a ‘time out’ day. ‘Everyone take the day off!’
This video inspired me to make a simple code in python that takes a number and returns what day that would be in an hypothetical 13 months calendar. It's super cool and way simpler than the calendar we're used to, both mentally and computationally
Is it available to the public? Why date would it be for July 21 2024?
I'm on board! Actually, for the last few years I've been saying the calendar should be 13 months with 28 days each. It just makes so much more sense! Though I'm not opposed to adding one extra day to the calendar at the end of the year such that every year starts one week day later (aside from leap year).
I also think the year should start around March 21st instead of January 1st. Spring is supposed to be the season of beginnings, so why not begin the whole year with it (sorry southern hemisphere)? Basically, we move Jan/Feb to the end of the year and shift everything ~3 weeks. The 13th month can go anywhere after December, that way Oct/Nov/Dec get to have their rightful place as the 8th/9th/10th months of the year.
While I'm at it, leap day should be a holiday.
I don't know, i kinda like that the year starts around the Earth's perihelion. Where else would you put a beginning to an elipse?
Another fun idea is abandoning time zones. Imagine if we create a standard earth time. For example, if you want to schedule an international meeting, then you might use earth time to aid in better communication.
Yeah, that's called UTC, and it's widely used.
There's just one problem with this: the date would change in the middle of the day for some people
@@lorenzograssi3637 I don't consider that to be a big deal. When I was working night shifts, you just needed to keep an eye on the clock when dating records.
Duude! In the end of the video you came so close to the calendar I've been proposing for a couple of years: 6 days a week, 6 weeks per month, 10 months a year. Extra days happen every other month.
Combining this with base 6, we could almost directly count the day of the year and know, by the digits, which day of the week, which week and which month any date is
But I also like the idea of having an extra almost week (and sometimes full on week) for a new year international festival or something
Ey your idea for the calendar at the end was exactly what I was thinking about too that I mentioned a few hrs ago in the other comments section
If they had 6 days in a week it could be 4 days working and 2 days off, with 8.5-9hrs a day on the working days instead of 8hrs to compensate if needed
the last two companies i worked for used 13 months! its so awesome. you budget and do everything for 12 of the 13 months, and you get a big fat extra paycheck twice a year with the way the math works out. More specifically, they use 26 pay periods that are 14 days long. the missing day just kind of floats and is never an issue (i think because of leap days in the 12 month calendar). With the 26 pay period system, every month has at least 2 pay periods, and then two months will have an extra pay period (usually june and december). the start of each pay period is usually a monday as well. sometimes it will be tuesday for banking delay reasons.
i always loved having the 13 months. there is never any guessing of where you are in the calendar with respect to getting paid lol
Yeah, week-oriented pay cycles are great. It’s always nice when your paycheck cycle laps around your bill cycle and you basically have a whole extra check twice per year.
Music lovers: you can also remember the months that have 31 days by thinking of a lydian scale. Whole step, whole whole half whole whole, then half gets us back to January.
8:08 I always heard it was because of Julius Ceasar and Augustus, who added their own months (July and August) to the calendar but didn't want cold winter months, so instead slipped them into the warmer summer/fall season.
That's a common misconception, but the fact that some months were renamed to July and August wasn't actually the reason why September/October/November/December got shifted later.
I was also taught this at one point, and it never occured to me how silly it was to think that someone could just add two months to a calender with drastically effecting its composition. It retrospect, it seems kind of obvious those months were renamed, not added.
the real reason was because the last months were seen as useless months where it was too cold to do anything, in fact nobody even bothered to name them because of it. one of the roman emperors disliked this and put it as the beginning.
@@ComboClass They were actually shifted before the rename - Quintillis and Sextillis became the seventh and eighth months during Julius Caesar's lifetime, and weren't renamed until after his death. He was born in Quintillis, so that became July.
@@Bovineprogrammer I'm not sure how to feel about the possibility of a Sextember...
It's probably for the better that we don't have that anymore.
We just need some print versions of the 13 month calendars that everybody can start using.
i never miss an upload, keep up the good work
Life's only been getting crazier these past few months. I love how Combo Class matches that chaos while being genuinely educational.
Calendar systems, Friday the 13th, frying eggs, praise for the superior base-6; what is there not to love!
Soiled labcoat & flooded backyard classroom... I can dig it!!
...secrets to your popularity of course.
Every year has a Friday 13th, when the first day of the month is Sunday, sometimes two Friday 13ths:
January and October, February and August (leap year), March and November, (leap year) April and July, September and December.
Three Friday 13ths January, April and July (leap year), February, March and November.
I love the studio.
For a TTRPG I made a calendar based on the 365.25 day year. It had 4 seasons x 3 months x 5 weeks x 6 days + 4 weekless holidays. Once or twice per year, there would be an extra “eve” day to cover the remaining 1.25.
The extra days were assigned according to a 16-year “era” cyclical schedule, wherein each holiday had an eve 5 times. This meant I could throw in special cultural stuff to the game for the 20 special holidays each era, and was neat to world build in a setting where some civilized beings live for hundreds of years.
I normally don’t pull real-world details like the 365.25 day year into my games, but forcing the 4-season division into it lead to some interesting and enriching results.
That’s why I love math. You can just say “So what if…”, and work out the consequences of a hypothesis, and a lot of things fall into place in interesting ways. If your results are boring or contradictory, you can amend your hypothesis based on what you’ve learned.
I love 13 months....March should represent the first day of spring....originally April 1st.....28 days each month....91 days per season.... 😊
the 13-month calendar is great and something I've thought about since forever, absolutely hate that you have the week start on a sunday though
why would you hate the week beginnig on a sunday? that is the day everyone has collectively agreed upon as the start day, despite there being some stragglers who place it as monday.
is it because sunday is commonly treated as the seventh day by churches?
@@aidenaune7008 The week here starts on Monday and it does in a lot of places, with calendars formatted that way
I think Monday also makes more sense as the start of the week because for a lot of people it lines up with the start of the work week
@@CamerTheDragon saturday and sunday are collectively known as the week ends, the plural often used states that it is two ends, meaning sunday is the start (first end) and saturday is the end (last end). work schedules have been modeled around this as well, with the days neatly placed between the ends instead of placing one of the days off in the middle which makes the most sense if you were to act as if there were no proper ends. not only this, but we treat it like that as well in our behavior; saturday is used as the rest day at the end of the week, while sunday is the prepping day for the upcoming.
sunday is the start of the week in almost all senses, other than when work starts, but using that is just as ridiculous and arbitrary as claiming friday is the end of the week because it is the last day of work.
sunday is objectively the day we as a planet have decided is the start.
@@aidenaune7008 Here it's referred to as the weekend as a singular
@@aidenaune7008 I've never heard "weekends" plural referring to the previous Sunday and following Saturday as a pair. I've only ever heard "the weekend" referring to both Saturday and Sunday (adjacent), with "last weekend" meaning "the previous Saturday and Sunday", "next weekend" meaning "the following Saturday and Sunday", and "weekends" referring to multiple of these pairs of adjacent days, as in "I'm free on weekends".
Regardless, the week actually starts on Saturday, because the hours of each day were named after the seven "planets" in a cycle, which were later assigned to the days themselves instead depending on which hour started the day. The hours were named from furthest planet to nearest, Saturn -> Jupiter -> Mars -> Sun -> Venus -> Mercury -> Moon, before looping back to Saturn and repeating. When you assign the first hour of each day to the day itself, you get Saturn's day (Saturday) -> Sun's day (Sunday) -> Moon's day (Monday) -> Mars' day (now Tuesday [Tiw's day] because of Vikings; but look at other languages for the origin, e.g. in French it's Mardi) -> Mercury's day (Wednesday [Woden's day], but French: Mercredi) ->Jupiter's day (Thursday [Thor's day], but French: Jeudi) -> Venus' day (Friday [Frigg's day], but French: Vendredi). The pattern holds throughout almost all Greek and Latin languages, as well as Welsh, Cornish, Albanian, and most Indian and East Asian languages. Chinese used to use names based on the planets, but has since changed to numbers (in which Monday-Saturday are "Day 1" to "Day 6" and Sunday is... still Sunday).
I think the only thing keeping us from using the 13-month calendar is the transition. So let's use it already and others will have to catch up!
i thought about the 13 month calendar system wayy earlier without knowing that it was actually a proposed idea
glad to know sm1 agrees with me
My proposal: The year has 6 months with 61 days each, with 366 days in a year. Every fourth year we take away the 61st day of the final three months.
I just read a book called the Milana Legends, and they have a calendar very similar to this, except their leap day has its own day of the week called "Unday"! (All the other days of the week have different names than the ones on Earth.) They don't have any need for a "Year Day" because Milana orbits its star and rotates at a different RPM than Earth.
SO FUUUUN - hoping for a day on this planet with reason in our calendars and no clock changes!
2:23 omg I missed the last October Friday the 13th so much
As a programmer, I can tell that the calendar is messed up. The 13 month calendar seems easier to deal with than the one we currently have.
As a calendar savant I really appreciate this video
We had the same month-day song here in Italy growing up (though admittedly in Italian, not English) that roughly translates to "30 days in November, with April, June and September. Of 28 there's just one, every other has 31"
I'd probably rename Sol to Jove, considering his wife is represented in the calendar by the month of June. It's not really an international calendar with a Northern Hemisphere seasonal reference. The J³ is a nice pattern as well.
you could make the fixed calender have a leap week so every sunday is 7 days apart again
holy shit I just happened across your youtube channel. I knew sol in high school, can remember shooting the shit talking with you talking about brian eno 😂
The International fixed calendar would be so useful
No more scheduling bi-monthly things by saying "the first and third saturday of the month", just "every 7th and 21st"
ALL of your three cats are black? No wonder everything keeps falling and breaking apart! 😂😂
Other than the joke, great video again!!!! Might be a bit long but that's just more of your chaotic but awesome personality!
The loss of nearly an entire carton of eggs was too high a price. YOU HAVE GONE TOO FAR DOMOTRO!
My proposal:
12 months of 28 days, 1 month of 29/30 days (last month of the year).
Each day of the week is the same date throughout the year, and the 29th and leap day have a day of the week, so that there's variation over the years.
This is DC's Calendar Man level. Be aware of a new supervillian.
A 4/6 day work week would be a nearly even compromise between a 5/7 day work week and a 4/7 day work week, in terms of hours worked per year.
I am watching this 13 days after it was posted
If the day of the week never changes, people born during the week would never have their birthday on the weekend
I would prefer an eight-day week.
5 days for work
2 days for the weekend
1 day (preferably in the middle of the new 8-day week) for study
The step from working 5 to 4 days a week is rather large.
My fantasy series based on a "mirror Earth" has 11 months with 3, 11 day week each, with a "new year period" of 2-3 days depending on leap years, really similar to this, except a little more complicated, because I can't make it too simple
23:00 oats Jennings is known for making the better sequel to things, and made this structure minus the 6 day week
I think this should be the real calender
There were 10 months in the calendar before the Julian Calendar, the months were longer.
In the Julian Calendar the months were shortened, months February and September were added, and April was changed from the 5th month to the 4th month.
Before the Julian Calendar the order of the first 7 months were in the same order as the days of the week.
1st (Moon) Monday, January..........2nd (Mars) Tuesday, March,...... 3rd (Mercury) Wednesday May
4th (Jupiter) Thursday, June ......5th (Venus) Friday, April ...........6th (Saturn) Saturday, July
7th (Sun) Sunday, August
And the last Sun day (Sunday) of the year was Mithra day, 3 days after the Winter Solstice, the birth of a renewed Sun (daylight getting longer). Now known as Christmas. The time to start of a new solar calendar
The Ancient Egyptians had a 12x30 calendar for liturgical reasons with 5/6 "days on the year" that were considered bad luck, so nothing was ever really planned by the state or religious officials on those days
0:37 "any previous year that also had its first day on a Sunday, and also wasn't a leap year". It would also need to be a year where a full moon happens between April 2 and April 8 - so that Easter would be the same date of April 9. 2017 had full moon at April 11, so its Easter would be on April 16. For example, 1950 was a common year starting on Sunday, and had Easter on April 9.
yeah!
In the Gregorian calendar the 13th day lands on Friday more often than any other day. 400 years is exactly 20871 weeks so the calendar repeats every 400 years. Counts in 400 years: Mon:685 Tue:685 Wed:687 Thu:684 Fri:688 Sat:684 Sun:687.
I'd hate to have my birthday on a workday every year while my friend can always celebrate on weekends
I'm surprised this is not mentioned in any of the comments that spring up at the top of the comment section for me, but the 30days*12months+5(6)extra days calendar is actually how Hobbits in the Shire in Tolkien's world counted days. With the exception that the week was still 7 days so each month had its own counting of weekdays. However, some of the extra days were not a part of the week just like you proposed, so every year could still use the same calendar. Tolkien actually played with calendars quite a bit and there were special elven calendars and there was a made up history of calendar reforms.
13 months starts Suday April 1st.
Autumn equinox is September 11th.
Its on my channel.
The whole round world, lets call it 360, multiplied by all of the good, 777, divided by all of the evil, 666, gives you....
Some much needed stress relief
This International Fixed Calendar is kind of cool, but it'll happen. Not unless you somehow break the monopoly of Big Calendar.
We need more cats
All for the 13 month calendar, but any calendar that uses 7 day weeks, needs to start on a Monday, not a Sunday. Never understood the nonsense of splitting the weekend either side on calendars that do that.
It takes 19 years for the lunar phases to return to the same position relative to the sun (this is the Metonic cycle). I propose a calendar with 19 months of 19 days each (plus 4 or 5 extra days) to honour this cosmic cycle.
So that means 235 synodic periods = 254 lunar orbits = 19 solar years = 6,939.75 days. What arrangement could we use to honor each of these periods and still have some reasonable length week in a Metonic calendar?
If you want to keep track of the moon as well as the sun, but dislike the inaccuracy inherent in lunisolar calendars, you can have 365-366-day years, whilst dividing up the months so that a given phase of the moon occurs on a given day every month within a year. The day of the month when a given phase of the moon occurs will approximately repeat every 19 years
The Scotty Kilmer of calendars.
I love 13 months....March should represent the first day of spring....originally April 1st.....28 days each month....91 days per season.... 😊
I've oft thought about having a calendar very similar to the IFC that Demotro displays, with only a couple of tweaks. ie. Making Gregorian March a New year, and making Feb 28/29th a "Month 0" void for an End of Year celebration and Leap day... or even save up a handful of Leap days, to have a full Leap Week.
February didn't get ripped off. February is when we all get ripped off on our monthly bills.
13 Month calendar is aka, the Lunar calendar. There's a movement to try and get it standard again. Foundation for the Law of Time.
There are ~12.368 synodic months in a year, not 13
BSK-KTS-RRF Friday the thirteenth level I had made on the 2nd last Friday the 13th of 2019.
Yeah just have the 5+leap year days be BONUS WEEKEND like oats Jenkins did
13:05
Typo:
5×71 = 355
Oh whoops, I meant (5)(73). I'll add a clarification in the description. Thanks for pointing that out
If the earth was a dodecahedron, then where is the edge, huh?
Check mate, dodecahedron-earthers!
I have a little idea for a calendar:
Instead of having 12 or 13 months in an year, how about we have 6 months. This might sound like it is too little, but hear me out:
Remember that concept where you could have 366 days in an year minus a leap day? This calendar is based on that concept.
There are 6 months in an year with 61 days each. If it is not a leap year, the last month will have 60 days instead of 61. I also think that there should be six days in a week instead of 7. Also, the 61st day of every month should not have a day of the week and should instead be called a "bonus day". The reason for this is because 60 and 6 are both highly composite numbers.
So basically, there's 6 days in a week, 10 weeks in a month, and 6 months in an year. And there's bonus days to compensate for the extra 5/6 days. On leap years, every month has 61 days (60 + 1 bonus). On non leap years, the sixth month of the year, aka June will not have a bonus year.
Half of the year would be 3 months, a third of the year would be 2 months and a quarter of the year would be 15 weeks or 1 month and 5 weeks.
This is sorta like the idea proposed at the end, but specifically choosing to distribute the bonus days on the end of every even-numbered month, with the exception of the last month in non-leap years, then joining each pair of months together
You don't need leap days in the calendar. In one person's lifetime, the calendar would drift less than a month, and each generation could just get used to the months being in different seasons. For this century summer would be mostly June, July, August in the northern hemisphere, and next century it would get closer to July, August, September. For example, before they adopted the Gregorian calendar, the solstices and equinoxes had simply drifted about ten days off, and they could have just allowed it to drift a little every millennium. The only reason for the adjustment of the Gregorian calendar was to fix the calendar at some building that marked where the sun was on any given day of the year.
A year of 364 days would be much simpler. Also, other options besides a leap day could be done, like a leap week every 28 years, or a leap month every 112 years. I suspect, if we went to the leap be month, people in 112 years would rather the days just float through the seasons, and leap days would be a thing of the past.
The calendar with 366 would be nice. Months with 31 and 30 alternated with a no 31 from 8 to 8 years...
This way an odd month will have odd days, an even month will have even days...
Or at the end of the Year everyone would get a week free. Except that from 8 to 8 years we will have a Harsh Year (Without Free Week).
With 6 days we can have too Weekends and Midweeks: 2 Work Days + 1 Midweek + 2 Work Days + 1 Weekend.
So with this everyone would work at most 240 days a year at regular jobs. Better than our callendar
Nerds must think alike bacasue I constantly think there has to be a better way to our calendar. This fixes many of the issues I have. Lets Change!!!
i have triskaidekaphobiaphobia - fear of fear of the number 13.
The thunder was god warning you not to ignore the sabbath
came from the Combo Class Bonus stream ^^ and a Random from me
3:45 we all know that the earth is shaped like a chicken nugget
360 days + a leap month every 6 years.
Thregorian Thralendar
12:53 That’s actually 5 times 73.
12:28
FART
One of your newest tiktok videos, about interesting numbers got me thinking … is there anything interesting about the year 2023, or frankly any year in the recent past or near future
Why not flip the Days/Weeks in your 360+5+Leap concept from five 6-day weeks to six 5-day weeks. Because the +5 if used all at the same time of year, it will be the same length as every other week in the year. Basically have a 13th 1-week long "month" and call it New Years Week or something to that effect. Leap years would then start their year with a leap day, essentially delaying the start of the calendar by a day (and wouldn't get an assigned month or day of the week).
Ultimately, though, I do think the 360+5+Leap calendar would be too messy and I strongly believe in a 364+1+Leap calendar just as you described. Except instead of the leap day being in the middle of the year just before the month of Sol, I would (as mentioned earlier) delay the start of the year by a day, turning the previous year's "Year Day" holiday into a 2-day bash every 4 years.
I heard about a better idea, called The World Calendar. Instead of 13 identical months, it has 4 identical quarters. Each quarter has a 31-day month followed by two 30-day months, and each month has the same number of weekdays. Leap Day and Year-End Day would be the same as you described. Then, we would have "only" 4 Friday the thirteenths every year.
How about we just don't have months or weeks and just count the (fractional) number of days since the start of the year?
When they added August and June January and February gone at the beginning of the year
As a programmer the idea of introducing days that have no defined month or name makes me anxious.
Proposal: Define the day of the year as the (fractional) number of days starting from New Years (e.g., New Years=[year]/0, 12 hours later=[year]/0.5). That ought to scare you!
God this is the day when everything happens
Not to mention the earth would be a couple miles away even at that scale.
Sunday is the first of the Week? Never sincerly the rest of the world
Is the video about complex bases of numbers coming soon? Can't weight to see it