Really fascinating. So many things I am hearing for the first time. Very interesting how 12/25 is one of the four days when the sun time and clock time match.
I have been expecting video's about earth orbital rotation. Thanks a lot for excellent explanation and fascinating animation. Background music is cool...
I was just wondering if we could record the sun's position everyday on the same time every single day. Never knew it would be something named *Analemma* , Great info 👍
If you own a globe, try this neat experiment. Place the globe a few feet from your fireplace. If you've got the northern hemisphere tilted away from the fire, the after a few minutes the top half of the globe will be cooler to the touch than the southern hemisphere. Repeat for different "seasons" on your globe's hemisphere.
just when i thought that this is only applicable to people on earth's northern hemisphere, it goes to explain how it would look like on other parts of earth's latitude including the southern hemisphere (the other side of the world) and even other planets. Cool!
HI, It's a little more complicated than indicated. The tilt alone creates a figure 8. The eccentricity moves the 'crossing point' away from the center. And the offset of the perihelion from the solstice rotates the u about the y-axis, making is asymmetrical in the left-right dimension.
So during summer in the southern hemisphere, the closer distance to the sun in January equates to hotter temperatures in Australia compared to Canada in July?
Watching these kinds of TED-ed videos is like making new connections between neurons in your brain coz you always learn atleast 1 new fact after each videos 🤭
+Technoguy3 In the Northern Hemisphere it is winter now because that end is tilted away from the sun. But because the Earth is at perihelion (closest part of orbit to the sun) the winter is slightly warm. In July, the Northern Hemisphere has summer, but it's at aphelion which has the effect of making the summer slightly cool. So in the Northern Hemisphere, summer and winter temperatures are mild because the tilt and distance partially cancel each other out. In the Southern Hemisphere, they add together which makes summer and winter temperatures more extreme.
It looks like the Earth goes through many kilometers of distance changes in its elliptical orbit but the tilt does not account for that big of a distance. So why does the tilt cause greater temperature fluctuations than the Earth being further away from the Sun?
Technoguy3 That's a good question, given that the difference in distance from the Sun between perihelion and aphelion is about 5 million kilometres, compared to the Earth's diameter which is only about 12,800 kilometres. In going from perihelion to aphelion, the total energy we receive from the Sun decreases only by about 6.3%. This is because the difference in distances is still small compared to the average distance from the Sun (150 million kilometres). So his change doesn't have a big impact. The side of the Earth that points towards the Sun is the side that receives more _direct_ energy from the Sun - about 62.5% of the total. While the side that points away is left with 37.5% of the total. So in going from winter to summer, the increase in direct sunlight is 67% [(62.5-37.5)/37.5]. So when the *Northern Hemisphere* goes from mid winter to mid summer, the change in the Earth's distance from the Sun causes the Earth's total energy received to be reduced by only 6.3%. But the axial tilt means that the fraction of that total energy that falls on the *Northern Hemisphere* increases by 67% - this is more significant and that's why it's the tilt that causes greater temperature fluctuations.
@@kenlogsdon7095 that's quite a smartly reply 4 years after the original request. When she asked it's possible that there were no closed captions available for this video.
And for the record I say all rotation is being produced by the ocean's rotation only and simply by reflection from below to above, like a record player playing none stop while the ocean levels decrease and increase creating winter spring summer and fall with a rotation affect and the sun light comes from volcano Ambrym in front of Australia.
You wouldn't even need to leave the solar system to find a different shape analemma - we could just trace the pattern observing on any rocky body in the solar system, provided we stay all or almost all of its year and do observations at its noon.
I totally understand why it would be on different heights, but the elliptical movement of the earth relative to the sun technically doesn't explain why it goes in eights. Maybe it is because I understood the ellipse as if it is "flat" towards the sun? Or is the ellipse itself tilted as well?
The last bit confused me - as in, I couldn't picture why the elliptical orbit would result in a figure of 8. I know it's not that complicated, but unless I have a picture in my head - I don't have the 'ah-ha' - because I only think in pictures. Early christmas drinks may not be helping.
+Fran Selles are you from Australia as well? I am from the UK and December is in the winter for us and I was so used to that fact that I was surprised about the initial comment.
what i like with these videos is that they are all accurate in the animations, because here the earth doesn't spin around the sun in a real circle but in an ellipse and they added that small detail in the animstions great vid!
Again, youtube read my mind. I just watched a video OFFLINE that has something to do with season in there, and then i got curious about sun movement and later, puff... this was in my recommendation.
@@ofigetdaitedve Only two seasons in the top end, wet and dry. Average daytime high Darwin, middle of 'winter' 31°C. Overnight average low 19°C. No place for snowflakes.
How is earth's axial tilt independent from the sun? Why is the earth "bound" to the sun due to gravity, but the direction of the tilt of it's axis is not? In other words: How does the north pole point to polaris at all times? How does the axis "know" where to tilt/where to point to?
Our Earth is rotating anticlockwise looking downward from North Pole side like as the illustration (0:34), when looking along the equator it rotates from West to East. What has happened, on the illustration(3:25),the Earth is rotating from East to West. Is this a quiz finding out the error?
You can see the Figure 8 path in the winter in TX. In spring and summer it switches to a straight diagonal line. What doesn't make since is it's farther away in summer when it's hotter and closer in the winter when it's cold.
The distance is miniscule compared to the effect of how much time each hemisphere spends exposed to the sun and the angle in which light enters the atmosphere, the bigger the angle, the more it gets reflected and loses energy.
It didn't. The north pole was pointing up and to the right at Polaris, and then the Earth moved forward 6 months to the right side of the screen and the north pole was still pointing up and to the right at Polaris. Presumably what you mean is why didn't the north pole remain pointed at a point directly above the sun, ending up pointing up and to the left. _That_ would have been a change of direction, and would require a gigantic force to change the Earth's angular momentum to force it not to simply move as its original momentum dictated, i.e. as depicted (far from to scale) in the video. No such force is in operation (it's hard to imagine what even _could_ exert it), so the axial tilt doesn't change noticeably on time scales of a day or year.
I had a globe with that figure-eight thing on it, but I never knew what it was.
@@auroraborealis5565 Writers strike.
Really fascinating. So many things I am hearing for the first time. Very interesting how 12/25 is one of the four days when the sun time and clock time match.
Really tough to visualise.. I'll have to watch again
Nice pun
+Chike Ezebilo You should just go straight to the source and watch it.
+matt THORNE no. just no
try youtube video dMoLUIpsE7s with English subtitles
@@SolusBatty I am loving and with the sun world world of su n I mean sun enlarging the world
Published on the longest night of the year...well played Ted...well played.
3:52 Relaxing aussies.. lol.
Nice animation throughout.
Tonight is the longest night of the year
In the northern hemisphere only
Still 60F here.
+Ravi Singh - One would almost think the release time of this video wasn't completely coincidental...
+Ravi Singh
OH! DON'T YOU SAY???
Because it's my birthday! 😊
brilliant ! movement of sun animation by gordon williamson is totally brilliant ! thanks.
Great video! Loved the animations on this one :)
So fantastic video. So many things that I never heard before
I have been expecting video's about earth orbital rotation.
Thanks a lot for excellent explanation and fascinating animation. Background music is cool...
TedEd...you guys are awesome!
ted ed really has answers for every question you've got!
First TED-Ed video that was actually pretty hard to understand... +Ted-Ed I want more videos like this!
go watch star wars then you will be thrilled
these lesson's are amazing
Woah, this animation was so pwetty .w.
Thank you. You always help me
Thank you!! Great content with good animations :)
Thanks Ted Ed, you never to fail
Thanks, did not know this, excellent explanation.
Axial tilt - the reason for the season!
Thank you brother for sharing this with us.
This is the greatest video online. The reason the Internet exists.
I was just wondering if we could record the sun's position everyday on the same time every single day. Never knew it would be something named *Analemma* , Great info 👍
This was a great chemistry video
This is fantastic!
0:00 - 0:05 the sound when you know you are about to get a shit ton of knowledge..
Thank you! After more than 30 years of existence, I finally learned what causes seasons.
Really? 30 years?
Wow 30 years, and you accept this as truth?
@@teachmetruth3539 take your tinfoil hats somewhere other than the youtube comment section
Beautiful.
If you own a globe, try this neat experiment. Place the globe a few feet from your fireplace. If you've got the northern hemisphere tilted away from the fire, the after a few minutes the top half of the globe will be cooler to the touch than the southern hemisphere. Repeat for different "seasons" on your globe's hemisphere.
I thoroughly enjoy these videos, especially about celestial bodies and roman times
Why my brain doesn't seem to understand this..?
cuz u dumb
+Vegeta well that was mean
becoz science want us to believe earth is round but the truth is earth is flat..
+francis dale Marcelo and my dick is 12'7 inchs
+Lanon Jr Well, you will one day. Just let time pass by and learn things while it is passing by. ;) Good luck and happy holidays. :)
It was great to me. I really heard all this the first time. My teacher never explained like you did. Your explanation is way better .
Excellent!
aaah this was such a good one ^^
Would it still do the analemma if you took the pictures at exactly solar noon every day? Or would it just go up and down?
just when i thought that this is only applicable to people on earth's northern hemisphere, it goes to explain how it would look like on other parts of earth's latitude including the southern hemisphere (the other side of the world) and even other planets. Cool!
HI,
It's a little more complicated than indicated. The tilt alone creates a figure 8. The eccentricity moves the 'crossing point' away from the center. And the offset of the perihelion from the solstice rotates the u about the y-axis, making is asymmetrical in the left-right dimension.
OMG that's what that figure 8 is on my globe!
where
It is not on mine
@@nazalostizsrbije The older versions have it, not the new ones.
@@Smartercow Ok
@@nazalostizsrbije Not all globes have it.
So during summer in the southern hemisphere, the closer distance to the sun in January equates to hotter temperatures in Australia compared to Canada in July?
thats awesome!
i knew all this stuff except about the 8 and the earths orbit and how we move faster in january
I thought TED should give more reliable info. "8"-form is firstly due to axial tilt. And eccentricity just gives some asymmetry to this "8"
Watching these kinds of TED-ed videos is like making new connections between neurons in your brain coz you always learn atleast 1 new fact after each videos 🤭
"But there's a twist"
Get the pun?? XD
(right after, the narrator talks about inclination)
One reason why I liked the video: The song actually sounds like a Universal Sandbox 2 relaxing song/sound.
If the Earth is further away from the sun in July, shouldn't it be colder then?
the seasons come from the earth's tilt, not distance from the Sun.
Because the Earth is tilted away from the sun, we have winter, yes?
+Technoguy3
In the Northern Hemisphere it is winter now because that end is tilted away from the sun. But because the Earth is at perihelion (closest part of orbit to the sun) the winter is slightly warm.
In July, the Northern Hemisphere has summer, but it's at aphelion which has the effect of making the summer slightly cool.
So in the Northern Hemisphere, summer and winter temperatures are mild because the tilt and distance partially cancel each other out.
In the Southern Hemisphere, they add together which makes summer and winter temperatures more extreme.
It looks like the Earth goes through many kilometers of distance changes in its elliptical orbit but the tilt does not account for that big of a distance. So why does the tilt cause greater temperature fluctuations than the Earth being further away from the Sun?
Technoguy3 That's a good question, given that the difference in distance from the Sun between perihelion and aphelion is about 5 million kilometres, compared to the Earth's diameter which is only about 12,800 kilometres.
In going from perihelion to aphelion, the total energy we receive from the Sun decreases only by about 6.3%. This is because the difference in distances is still small compared to the average distance from the Sun (150 million kilometres). So his change doesn't have a big impact.
The side of the Earth that points towards the Sun is the side that receives more _direct_ energy from the Sun - about 62.5% of the total. While the side that points away is left with 37.5% of the total. So in going from winter to summer, the increase in direct sunlight is 67% [(62.5-37.5)/37.5].
So when the *Northern Hemisphere* goes from mid winter to mid summer, the change in the Earth's distance from the Sun causes the Earth's total energy received to be reduced by only 6.3%. But the axial tilt means that the fraction of that total energy that falls on the *Northern Hemisphere* increases by 67% - this is more significant and that's why it's the tilt that causes greater temperature fluctuations.
Great video
Great music!
This was so interesting
Amazing.
Brilliant gem!
Please add closed captioning or subtitles for the deaf and hearing impaired audiences
Please feel free to discover the TH-cam closed captioning feature and how to turn it on.
@@kenlogsdon7095 that's quite a smartly reply 4 years after the original request.
When she asked it's possible that there were no closed captions available for this video.
Did anyone else keep thinking of the Van Gelis tune 'Albedo 0.39' when watching this?
great video
Thank you!!!!!
I thoughed a long time about this. Thanks for sharing this explanation.
It makes me way to angry I never learned this all at school..
Something wrong with you I think
very cool, I had no idea
VERY INTERESTING!
And for the record I say all rotation is being produced by the ocean's rotation only and simply by reflection from below to above, like a record player playing none stop while the ocean levels decrease and increase creating winter spring summer and fall with a rotation affect and the sun light comes from volcano Ambrym in front of Australia.
I much prefer spring & fall since it's warm in them.
one of the finest videos of ted ed
Nice accounting for the people who don't live on earth at the end. Feels good to be included
You wouldn't even need to leave the solar system to find a different shape analemma - we could just trace the pattern observing on any rocky body in the solar system, provided we stay all or almost all of its year and do observations at its noon.
Garden lake scene is beautiful and what type of cartoon drawing is this
can I please get to know the name of the soundtrack?
Technically, not the longest day of the year, but the day with the greatest number of hours with the sun above the horizon.
I totally understand why it would be on different heights, but the elliptical movement of the earth relative to the sun technically doesn't explain why it goes in eights.
Maybe it is because I understood the ellipse as if it is "flat" towards the sun? Or is the ellipse itself tilted as well?
Nice art style
And we who lived near the equator never experience this solstice =(
It seemed simple, then complicated, then simple in the end.
Thanks a lot thank youuuu
when is it a teardrop
a ted-ed video that isn't designed to feed people's anxieties - hooray!
Hi, How it reaches its farthest point in July, and still hot? isn't it supposed to get colder??
Hello Ted-ED how's it goin? :)
The last bit confused me - as in, I couldn't picture why the elliptical orbit would result in a figure of 8. I know it's not that complicated, but unless I have a picture in my head - I don't have the 'ah-ha' - because I only think in pictures. Early christmas drinks may not be helping.
When a planet has an elliptical obit, it travels fastest when it is nearest the sun and slowest at its farthest point from the sun.
Stationary Earth, it's the that complicated
emm the 22th of desember is in fact the longest day in the year. its around 30 secs longer.
Here in Australia it's currently summer, and the sun starts to come up at 4am and doesn't fully set until 9pm.
What month is it for you in Australia? (December in UK)
+Lewis Price you're joking, right?
So December is in the summer for aussies then? I was just confused about "December in summer"
+Lewis Price silly sausage
+Fran Selles are you from Australia as well? I am from the UK and December is in the winter for us and I was so used to that fact that I was surprised about the initial comment.
Bu videoları güncel ve türkçe altyazı ile nerden bulabilirim?
what i like with these videos is that they are all accurate in the animations, because here the earth doesn't spin around the sun in a real circle but in an ellipse and they added that small detail in the animstions great vid!
yes great vid if you like cartoons
Again, youtube read my mind. I just watched a video OFFLINE that has something to do with season in there, and then i got curious about sun movement and later, puff... this was in my recommendation.
Yeah I know. what a load of rubbish
So cool
The sun and moon follows me everywhere I go
They're stalking you. Call the FBI.
I live in Australia.
What's winter?
winter is June-August for you. That is when you have average temperature +13C, not +23 like in January
@@ofigetdaitedve
Only two seasons in the top end, wet and dry.
Average daytime high Darwin, middle of 'winter' 31°C. Overnight average low 19°C.
No place for snowflakes.
@@BentConrod - Darwin is not far from the Equator. I meant Sydney, let's say.
"No place for snowflakes" - ok )
i learned nothing from this video...
because it is way to complicated for me
XD
and i love this channel
:)
Very honest. I wish more commenters here were like you.
How is earth's axial tilt independent from the sun? Why is the earth "bound" to the sun due to gravity, but the direction of the tilt of it's axis is not? In other words: How does the north pole point to polaris at all times? How does the axis "know" where to tilt/where to point to?
There is a geometric and a magnetic north pole, he is talking about the magnetic
Richard Dawkins - The magic of reality"
your reality is not real dude
Our Earth is rotating anticlockwise looking downward from North Pole side like as the illustration
(0:34), when looking along the equator it rotates from West to East.
What has happened, on the illustration(3:25),the Earth is rotating from East to West.
Is this a quiz finding out the error?
I sun gaze and I see the sun go down more to the left on winter months and more to the right on summer months
I am still confused.
We at the equator always encounter the sun high up in the sky, at zenith even.
That was it. It gives us a sign of infinity
What would an analemma look like on Uranus?
Please
But wouldn't that change the equator?
You can see the Figure 8 path in the winter in TX. In spring and summer it switches to a straight diagonal line. What doesn't make since is it's farther away in summer when it's hotter and closer in the winter when it's cold.
The distance is miniscule compared to the effect of how much time each hemisphere spends exposed to the sun and the angle in which light enters the atmosphere, the bigger the angle, the more it gets reflected and loses energy.
so in australia how ?! thanks
is analemma in mars same as in earth? if isn't what it's look like?
1:27 why did the pole change direction?
It didn't. The north pole was pointing up and to the right at Polaris, and then the Earth moved forward 6 months to the right side of the screen and the north pole was still pointing up and to the right at Polaris.
Presumably what you mean is why didn't the north pole remain pointed at a point directly above the sun, ending up pointing up and to the left. _That_ would have been a change of direction, and would require a gigantic force to change the Earth's angular momentum to force it not to simply move as its original momentum dictated, i.e. as depicted (far from to scale) in the video. No such force is in operation (it's hard to imagine what even _could_ exert it), so the axial tilt doesn't change noticeably on time scales of a day or year.
If the north pole always pointed towards the sun then seasons would be no more
Today, 22nd of December 2015, is the shortest day of the year
this makes more sense on an azimuthal equadistant map.
How so?
It really doesn't.
Because earth is flat
If you invert the definition of sense, then sure.
This whole explanation was a bit moist.