The visualizations of the planet revolving around the sun, along with the accompanying narration, was really helpful for my understanding of the processes - i.e, seasons and the earth's wobble. Before the video, I had a fuzzy understanding. I now see why these concepts make sense. An excellent video!
Its a little bit of a misunderstanding that the solstice is the "peak of summer/winter". The peak is often interpreted as the most extreme of the season but that weather typically trails behind the solstice by 4-6 weeks as the time with increased/reduced sun increases/decreases the temperature. The solstice is indeed the shortest day of the year and the longest day of the year outside of the tropics of cancer/capricorn, just not the hottest/coldest day
The 23h 56m period is the siderial day, that is, the time it takes the earth to rotate 360 degrees relative to the stars. Since the earth is continuing to move around its orbit, it takes another 4 minutes for it to make 360 degrees relative to the sun, which is the solar day--the one you read on your clock.
God I love this. I always hated geography at school, with having to memorize lists of capitals and all that. This I love! Putting everything in context so it makes sense, and all that. Brilliant, thank you!
For those wondering: "A day" in normal usage means 24 hours. A day as an unit measurement is exactly 24 hours. A "civil day" in a sort of bureaucratic sense is 24 hours plus or minus a second or two whenever we have a leap second to match changes in Earth's rotation. The time from a noon to a noon, a solar day, is 24 hours give or take a few seconds, and for obvious practical reasons this is what we mean by day in the normal sense. The sidereal time, ie. the actual time it takes for Earth to fully spin once, is about 23 hours and 56 minutes. The difference between the two is because during each day, Earth advances on its orbit around the Sun, so the next noon will always comes slightly before Earth has actually spun around a full rotation. There's also something called a stellar day, but this is almost exactly the same as the sidereal day. Sounds complicated, but important difference here is between a day, 24 hours, and a full rotation of the Earth, which is 23 hours, 56 minutes and about 4 seconds.
"First official day of Fall in the southern hemisphere". The australian Bureau of Meteorology would disagree. The Australian government says the seasons are. Summer 1 Dec - 28/9 Feb Autumn 1 March - May 30 Winter 1 June - Aug 31. Spring 1 Sept - 30 Nov.
I accidentally got enrolled in Geography for Undergraduation due to a messed up system of cut offs in India's central university and just hated it... but now am realising how misplaced my anger was and that its such a lovely subject and i couldn't have had this epiphany at a better time since now i get to follow this series like a TV show in real time!
The Earth wobbles based on how much water it has? So if it's really wobbly, the other planets are all going to say "Oh no, looks like Earth is drunk again." and they'll be right!
Yes. But only when it's sitting still. 😉 Hmm... actually... technically, I guess we could also say it moves at the same speed of the earth if it happened to be traveling precisely due north or due south. But if the animal is moving in any other direction, at any other velocity besides 0m/s then it is no going the same speed as the earth anymore. My intuition tells me that you already know all this though.. 😋
6:15 Earth''s orbit is elliptical *with the sun at one focus* . It took a second for me to remember that. If the sun was at the center of the ellipse (where the axes intersect), then the perihelion and aphelion would be 3 months apart but ... because distance from the sun doesn't affect anything, we'd never know the difference? 9:55 If the earth didn't rotate, i.e. spin, at all, then a day would be the same length as a year? One side would be very hot and one very cold *at any given time* , but the zone of heat and cold would move around the earth once a year? If the earth were tidally locked, so one side was always facing the sun and the other side always facing away, then it would rotate once a year? 10:00 But, if the earth rotated but didn't revolve -- hung in space spinning but not moving around the sun -- wow, that's hard to picture. It'd be like one particular day of the calendar forever, wouldn't it? So when you said "the length of a day would remain fixed," you meant the length of *daylight* would remain fixed for each latitude, right? The length of a *day* (one noon to the next) remains fixed anyway, or very close. Note 1: The actual circle of illumination (the line between light and dark) is called the terminator, right? Sunrise and sunset will both ve vaack. Note 2: You correctly stated that for the earth to spin once on its axis takes less than a day, but didn't explain why -- solar vs. sidereal day -- extra rotation needed for noon to catch up with the earth's travel in its orbit. I wonder if any of this is right.
Sorry, but 9:05 "[March 21] is the first official day of fall in the southern hemisphere" no it isn't. Here in Australia the first official day of autumn is 1 March. We don't use equinoxes and solstices (which, as you said about 30 seconds earlier, are the *peak* of their respective seasons) as the _start_ date for the season. That doesn't even make sense.
Regarding the tilt, it would mean warmer summers but colder winters for the southern hemisphere. But the dynamic of oceans and continents plays a huge role in how hot/cold it actually gets.
Will we crash to our furnitures if we jumped in our house and our speed suddenly stopped to 0m/s and will the rotation of the earth make us crash into our furniture?
Thanks for putting in some pictures of Russia here and there throughout your episodes. It's kind of unexpected but pleasant to see familiar landscapes)
Maybe at one point the moon was covered in water and spun in between the earth and the sun creating a water barrier and then (for some reason) the water was made to be knocked off the moon onto the earth causing the earth to tilt and wobble on its access with the added weight of the moon water leaving us where we are today? Maybe? Just me? Lol ok bye
It isn't accurate to say the Earth is "spinning". The Earth _rotates_ about its axis. Telling people that the Earth spins at 1600 kph at the equator, and 600 kph at a higher/lower latitude, is a best not useful. At worst it will cause confusion and misunderstanding. If we have two people at the same line of longitude north and south of each other, let's say one at the equator and one at latitude 45, the sun will track across the sky at the same rate for both of them. This is because they're not going different "speeds" like we're told here. Remember - motion is relative, so the figure of 1600 kph of spin speed at the equator is only relevant to an observer whose position is static in space above the planet (meaning that it does not follow earth's axial rotation), while following the planet's orbital rotation around the sun. Since it isn't likely (if not impossible altogether) for anyone to occupy this observational position, it isn't useful to anyone to know that figure of 1600 kph. Same goes for any other figure for any other latitude. That information is equally as useless. So at the equator, the Earth moves 13x faster than a cheetah? Hogwash. That's only true if you're observing the planet from a magic bubble that perfectly matches Earth's orbital motion but somehow stands outside Earth's inertial reference frame. A much more useful and accurate description of the Earth's rotational velocity is this: Given 24 hours in a day, and 12 hours on the face of a clock, we can infer that the Earth's rotation is equivalent to *half the speed of the hour hand of a clock.* Try watching the hour hand of a clock for a little while. You'll notice it moves pretty slow. Earth's rotational velocity is _twice as slow_ as that..
Yes!! The Earth changes! Even it’s climate! Same as the solar system changes, as our Galaxy changes, as our Universe change AND POSSIBLY as other universes do. Everything drastically changes. Our climate on our world must change or all life would be doomed.
And wrong about the cheetah being slower. (I’m not considering how you used the cheetah as a reference point. Don’t get mad at me) technically the cheetah running the same way as the spin of the earth at the equator is going even faster than the earth. But only technically
Wait wait wait. The earth's rotation is offset from one entire day by almost 4 minutes? That's an entire 24 hours after 360 days?! That ... that means something, why aren't we talking about this? 😱
So the earth is like a spinning Quarter and wobbles as it slows down... /jk just ripping on Flatties as if they would EVER step foot on this page.... however they should probably be here the most..
The visualizations of the planet revolving around the sun, along with the accompanying narration, was really helpful for my understanding of the processes - i.e, seasons and the earth's wobble. Before the video, I had a fuzzy understanding. I now see why these concepts make sense. An excellent video!
Being a scientist and being asked by the kid you are babysitting this kind of questions... Best days of my life!
Her passion shines through so strongly. Keeps me ingauged and smiling! 😁
Its a little bit of a misunderstanding that the solstice is the "peak of summer/winter". The peak is often interpreted as the most extreme of the season but that weather typically trails behind the solstice by 4-6 weeks as the time with increased/reduced sun increases/decreases the temperature. The solstice is indeed the shortest day of the year and the longest day of the year outside of the tropics of cancer/capricorn, just not the hottest/coldest day
Fantastic series!! Love the presenter. She is an excellent teacher
Hopefully the precession will continue to proceed according to precedent.
The 23h 56m period is the siderial day, that is, the time it takes the earth to rotate 360 degrees relative to the stars. Since the earth is continuing to move around its orbit, it takes another 4 minutes for it to make 360 degrees relative to the sun, which is the solar day--the one you read on your clock.
Ballistics !
Vsauce? ;-)
I love how you guys make these videos that get everyone’s attention! We are big fans!
I love this series along with Organic Chemistry. Two of my favorites ❤️
30 yrs old, watching this vid while of course knowing all this, still thinking: " wooooooow, this is so amazing!!"
I feel the Earth... move... under my feet...
I feel the sky tum-bul-ing down, tum-bul-ling dooown, tumbling down...
6:09 im watching this on a leap day!
those monstera ear rings are so great
Your childhood sounds idyllic! I mean living in a house around an oak tree?!!?!
I know! So many kids growing in a tiny apartment in a giant and noisy city nowadays.
God I love this. I always hated geography at school, with having to memorize lists of capitals and all that. This I love! Putting everything in context so it makes sense, and all that. Brilliant, thank you!
I love this teacher! Thanksssss so muchhhh!!!!!❤❤❤❤
1:01 Nice That's Canmore's 3 Sisters mountain, such a beautiful icon and awesome place to see !
What keeps the planet spinning?
Ah ah
A force from the beginning!
- Daft Punk
For those wondering: "A day" in normal usage means 24 hours. A day as an unit measurement is exactly 24 hours. A "civil day" in a sort of bureaucratic sense is 24 hours plus or minus a second or two whenever we have a leap second to match changes in Earth's rotation. The time from a noon to a noon, a solar day, is 24 hours give or take a few seconds, and for obvious practical reasons this is what we mean by day in the normal sense. The sidereal time, ie. the actual time it takes for Earth to fully spin once, is about 23 hours and 56 minutes. The difference between the two is because during each day, Earth advances on its orbit around the Sun, so the next noon will always comes slightly before Earth has actually spun around a full rotation. There's also something called a stellar day, but this is almost exactly the same as the sidereal day.
Sounds complicated, but important difference here is between a day, 24 hours, and a full rotation of the Earth, which is 23 hours, 56 minutes and about 4 seconds.
We are incredibly lucky to have life here
Does the rotation also affect what goes on inside the earth?
This video was improve me thank you !
You think squirrels and ants are a problem with Oaks in autumn??? Armillaria mellea enters the chat.
Now I need you to show me your actual house. It sounds pretty cool to have a house on a tree.
Thanks
You described my dream home.
To future students studying, good luck.
A turtle approved this informational video
2.05 A bunch of gas in space, but it getting closer together... and it is getting closer together... and it is getting closer together, it's a STAR.
I understand that reference
3:25 CHOM CHOMS?
Awesome!!! Also you grew up in a weird house with a lot of extra chores. But it sounded cool.
God I love this channel!
Cool cool, but when is CrashCourse Geology coming?
Yes!! I’ve asked for it many times!
Geology rocks, but geography is where it's at!
@@sfranz5413 Geography applies to this Earth, geology applies to every body that's made of rock.
No, Crash course History of sports guys, we were teased it in European History
"First official day of Fall in the southern hemisphere". The australian Bureau of Meteorology would disagree.
The Australian government says the seasons are.
Summer 1 Dec - 28/9 Feb
Autumn 1 March - May 30
Winter 1 June - Aug 31.
Spring 1 Sept - 30 Nov.
I accidentally got enrolled in Geography for Undergraduation due to a messed up system of cut offs in India's central university and just hated it... but now am realising how misplaced my anger was and that its such a lovely subject and i couldn't have had this epiphany at a better time since now i get to follow this series like a TV show in real time!
Love me some Geography
So good
Watching this video from St.Petersburg
Educational!
I love listening to Alize talk. Also, sorry. My keyboard won't let me type your name right.
wooow! didnt know the earth wobbled :")
1:01 Canmore, Alberta, Canada 🇨🇦
Pov, your teacher lonked this as homework😂
The Earth wobbles based on how much water it has? So if it's really wobbly, the other planets are all going to say "Oh no, looks like Earth is drunk again." and they'll be right!
Wait a minute! Isn't the cheetah also traveling at the speed of the earth?
She is talking about cheetah at poles
Yes. But only when it's sitting still. 😉
Hmm... actually... technically, I guess we could also say it moves at the same speed of the earth if it happened to be traveling precisely due north or due south. But if the animal is moving in any other direction, at any other velocity besides 0m/s then it is no going the same speed as the earth anymore.
My intuition tells me that you already know all this though.. 😋
6:15 Earth''s orbit is elliptical *with the sun at one focus* . It took a second for me to remember that. If the sun was at the center of the ellipse (where the axes intersect), then the perihelion and aphelion would be 3 months apart but ... because distance from the sun doesn't affect anything, we'd never know the difference? 9:55 If the earth didn't rotate, i.e. spin, at all, then a day would be the same length as a year? One side would be very hot and one very cold *at any given time* , but the zone of heat and cold would move around the earth once a year? If the earth were tidally locked, so one side was always facing the sun and the other side always facing away, then it would rotate once a year? 10:00 But, if the earth rotated but didn't revolve -- hung in space spinning but not moving around the sun -- wow, that's hard to picture. It'd be like one particular day of the calendar forever, wouldn't it? So when you said "the length of a day would remain fixed," you meant the length of *daylight* would remain fixed for each latitude, right? The length of a *day* (one noon to the next) remains fixed anyway, or very close. Note 1: The actual circle of illumination (the line between light and dark) is called the terminator, right? Sunrise and sunset will both ve vaack. Note 2: You correctly stated that for the earth to spin once on its axis takes less than a day, but didn't explain why -- solar vs. sidereal day -- extra rotation needed for noon to catch up with the earth's travel in its orbit. I wonder if any of this is right.
Great Impala joke!!
When will Crash Course Maths be a thing?
6:40 NASA Orrery ♡
-Inconsistently
-Fair enough!
nice...
im only here because i remembered watching this in class one time and decided to revisit it
Wow geography nis interests!
Find fact, my girlfriend is born on the Winter Solstice and her sister was born on the summer Solstice
Uploaded 11 seconds ago. Wow I'm early.
Love these videos
And you're so cute
very interesting
What if everyone just pushes really hard?
Off of what? All action produces an equal and opposite reaction
Sorry, but 9:05 "[March 21] is the first official day of fall in the southern hemisphere" no it isn't. Here in Australia the first official day of autumn is 1 March. We don't use equinoxes and solstices (which, as you said about 30 seconds earlier, are the *peak* of their respective seasons) as the _start_ date for the season. That doesn't even make sense.
7:05 - what place?
The earth ISN'T spinning 1600mph. It's spinning 15 degrees per hour. Mph isn't used to measure rotation.
♫ I feel The Earth move under my feet ♪
Imaginary axis!?!
Want claim there is a big pin through the earth???
Please do a video on tropical cyclones
Well, it's all about "what is movement", because very fast you realize everything moves
10:00 wah?
Thank u 💯
But can u ask you something?
someones a waving inflatable tube man today
The Library movement!
wow
So, GEO literally means Earth and it took you fellas 5 episodes to actually get to it?
You know, I think I like this channel.
I miss this is middle school
actually if the cheetah was running in the direction of the rotation of the earth on the line of equator it would go faster than every human
Does that mean the Southern Hemisphere has hotter summers and warmer winters?
Regarding the tilt, it would mean warmer summers but colder winters for the southern hemisphere. But the dynamic of oceans and continents plays a huge role in how hot/cold it actually gets.
I also want to live in a tree😍 I envy her. The place I live is so noisy. 😭
Aphelion = app-helion, not uh-feelion
Ok
OYG.. you going to get a lot of dislikes from flerfs.
The earth moves... under my feet
Will we crash to our furnitures if we jumped in our house and our speed suddenly stopped to 0m/s and will the rotation of the earth make us crash into our furniture?
Thanks for putting in some pictures of Russia here and there throughout your episodes. It's kind of unexpected but pleasant to see familiar landscapes)
Maybe at one point the moon was covered in water and spun in between the earth and the sun creating a water barrier and then (for some reason) the water was made to be knocked off the moon onto the earth causing the earth to tilt and wobble on its access with the added weight of the moon water leaving us where we are today? Maybe? Just me? Lol ok bye
👍👍👍👍👍👍👍👍👍
We had a tree growing through part of our house. Eventually it had to go.
It isn't accurate to say the Earth is "spinning". The Earth _rotates_ about its axis. Telling people that the Earth spins at 1600 kph at the equator, and 600 kph at a higher/lower latitude, is a best not useful. At worst it will cause confusion and misunderstanding. If we have two people at the same line of longitude north and south of each other, let's say one at the equator and one at latitude 45, the sun will track across the sky at the same rate for both of them. This is because they're not going different "speeds" like we're told here. Remember - motion is relative, so the figure of 1600 kph of spin speed at the equator is only relevant to an observer whose position is static in space above the planet (meaning that it does not follow earth's axial rotation), while following the planet's orbital rotation around the sun. Since it isn't likely (if not impossible altogether) for anyone to occupy this observational position, it isn't useful to anyone to know that figure of 1600 kph. Same goes for any other figure for any other latitude. That information is equally as useless.
So at the equator, the Earth moves 13x faster than a cheetah? Hogwash. That's only true if you're observing the planet from a magic bubble that perfectly matches Earth's orbital motion but somehow stands outside Earth's inertial reference frame.
A much more useful and accurate description of the Earth's rotational velocity is this: Given 24 hours in a day, and 12 hours on the face of a clock, we can infer that the Earth's rotation is equivalent to *half the speed of the hour hand of a clock.*
Try watching the hour hand of a clock for a little while. You'll notice it moves pretty slow. Earth's rotational velocity is _twice as slow_ as that..
Yes!! The Earth changes! Even it’s climate! Same as the solar system changes, as our Galaxy changes, as our Universe change AND POSSIBLY as other universes do. Everything drastically changes. Our climate on our world must change or all life would be doomed.
My dad moved away to live in a house tree with monkeys
And wrong about the cheetah being slower. (I’m not considering how you used the cheetah as a reference point. Don’t get mad at me) technically the cheetah running the same way as the spin of the earth at the equator is going even faster than the earth. But only technically
Wait wait wait. The earth's rotation is offset from one entire day by almost 4 minutes? That's an entire 24 hours after 360 days?! That ... that means something, why aren't we talking about this? 😱
oh, the earth moves at a pace exceedly faster than that of the fastest cheater. waal
Bananas
Last time I was this early, the Greeks were still using epicycles to describe the movement of Earth and the heavens.
I'm disappointed by the lack of flat Earthers.
This video is biased to global north in saying our solar system moves counter-clockwise
I’m here bc hank green tiktok
You had an incredibly privileged childhood!
So the earth is like a spinning Quarter and wobbles as it slows down... /jk just ripping on Flatties as if they would EVER step foot on this page.... however they should probably be here the most..
Lol
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