How earth's tilt causes seasons | Cosmology & Astronomy | Khan Academy

[@PHZadeW]

Because he's a clever teacher, ha ha. As it's a common psychological teaching method to repeat sentences, so that they stick in the students mind. Advertising and music often uses some of these techniques in order to keep their product or song in the mind of the consumer. Have a good day! :)

[@thegrandfoundationchurchof7138]

Thank God for Khan Academy. It is about time to bring back free education! Our founding fathers wanted everyone to be educated. This is one of the main reason to live. We educated our selves since the day we are born. It is a never stopping thing we do. It is so fun! I really enjoy listen to Khan Academy.

[@thegrandfoundationchurchof7138]

***** Life is about right and wrong. If we don't do the right thing we are doing the wrong thing! That is what all really great great leaders in including Jesus as well as others to long to mention want us to do... not only for our selves but others. If we don't learn to share this world. Then there will be war with out end! It does not matter what you believe! The truth is the truth! The sun will rise tomorrow!

[@thegrandfoundationchurchof7138]

***** That is the problem. People believe they can do anything to others. With out a consequence of any type. Then they justify one more step in their own opinion or direction... saying its ok. Where does it end? Life is right and wrong in more than one way. You either live with values or you don't. Sound black and white as you said. Look at those who try to make there own and fail in there lives.

[@kambibolongo7530]

THE GRANDFOUNDATION CHURCH OF CHRIST "Let he who is without sin, cast the first stone." Yes, there are a billion shades of grey as can be attested from the above quote.

[@thegrandfoundationchurchof7138]

Omondi Akura It is nice that people can believe what they want. Good luck. That does not mean you are following God laws. Where does God say there are shade of grays of sins???

[@thegrandfoundationchurchof7138]

***** +Omondi Akura It is nice that people can believe what they want. Good luck. That does not mean you are following God laws. Where does God say there are shade of grays of sins???

[@hopegrungist5414]

Dude I just watch these for fun honestly. So one day I can go "we have seasons because of the tilt of the earth" for like no other reason than making me feel like a smart person :P

[@kevinforest9829]

InstaBlaster...

[@UncouthJosef]

I love your honesty. I wish more people who do this would be as honest about their motivation.

[@PorschaLaMaria]

I needed you as a professor back in college 👌🏼👌🏼

[@totyffanie]

This!! 🙌🏽😭 I have a test on Thursday, and all the professor does is read off his slides and elaborate barely. But here you explain everything. I so get it now! I wish you were my college professor! Thank you!

[@gonzaloayalaibarre]

"This is the sun right over here, this is the sun, that is the sun..." Urge to shout "Praise the sun!" intensifying.

[@saadahmad3805]

Thank you sir for auch a great explanation! I'm 20 and I'm wondering where I would have been today if I got such a great teacher throughout these years🙏

[@MeisterDonDon]

Thank you for this very interesting video. I really enjoy that not only do you make videos on school subjects but also things like these which answer questions about everyday life. It's nice to have videos like these which can make people appreciate how complicated something like seasons actually are and making people less ignorant of the things around them.

[@ardynites1733]

It solidifies it more in your head, and it gives him time do draw his pictures.

[@RiyadhElalami]

That is amazing, that is science. It was a bit of confusing at the beginning but I understand it well thanks Sal. I hope I will be half of what you are in the future

[@s.baskaran1370]

Thanks very much Sir.

[@KarlBonner1982]

I don't like the whole bit about the atmosphere absorbing more of the winter sun. Yes it is true especially for UV rays, but the real reason a low sun angle leads to less heating is that the same amount of energy gets spread out over a larger surface area when it hits the ground. The effect of a thicker diagonal column of air absorbing more energy doesn't explain seasonal variations!

[@homeschool8151]

that exactly what i thought, #GreatMindsThinkAlike

[@budb11]

Great explanation! I like this video. You did a really good job on explaining how the season occur. Thanks.

[@tariqshabirbhatti4793]

Great work ...

[@gregorysoutherland6911]

im so surprised that a flat earther hasn't come on to the comment section of this video and started ranting on "its a conspiracy" or "the government is feeding you lies or some crap"

[@FollowHorus]

Khan - you have such beautiful voice! You were born to do this! Thank you for making learning joyful for all of us.

[@diwitdharpatitripathi7427]

The four seasons❄☀🍃🍂❄☀🍃🍂❄☀🍃🍂❄☀🍃🍂

[@AccioVoldy]

From your previous video you said: Currently, Aphelion = Northern Hemisphere summer and Perihelion = N. Hemisphere winter Does that mean since summer in the northern hemisphere is occuring when the Earth is further from the Sun. Does that mean northern hemisphere summers are not as hot as southern hemisphere summers because of the 3% eccentricity in the orbit? Thanks :D

[@OmegaGenesisTrueEarth]

No, they will not address that because it destroys their model. Nothing about the southern hemisphere is equal to the northern when it comes to the climate even though it should be in the Globe lie paradigm!

[@Jiiiimmmmy]

It is due to the tilt again. In summer the sun is directly over-head, sun rays are falling pretty much perpendicular onto the earth surface. In winter this angle is sharper, the rays have to travel farther through the atmosphere (more adsorption and scattering etc.) for one thing. Also if you draw a diagram of earth and the sun, one with perpendicular and another with a sharper angle of insolation you will see that less energy falls onto a given surface area with a sharper angle of insolation.

[@QadirPopal]

awesome explanition.

[@hemanthhariharan5105]

Great video! Hats off to you Sal!

[@최소영-k7m]

khan, your a super hero!

[@TheViking89]

Love this Channel! Does anyone know what programme they use to make their videos?

[@orishawar7505]

Eh!! It just made my day..Tysm fr this..it is exactly what I wanted..

[@MadFoxRemixed]

Thank you !

[@shan8sk]

Mr Khan, I was watching the this video about earth's tilt causing the seasons. It certainly explains why the duration of night time and day time during summer and winter is different (the reason being axis of rotation is tilted) But, I did not understand one thing. All points on earth except the pole (south or north) points get sunlight at least for some time in a 24 hr cycle but the temperature (light energy) during those times are different in different season. For example, consider NYC.

[@KatiaTRH]

This is a great explanation. The only problem i had was that he kept saying "...tilted away from the earth..." when he should have said "..tilted away from the sun...". Anyways, i saw past that and i got the concept so thanks much.

[@ghostalin]

Sal, could you talk about tides and why the Pacific and Atlantic oceans are not at equal levels at the Panama Canal?

[@QadirPopal]

Thanks you... Please do keep it up....

[@Kenchan1337]

very good video, 1:27 i can stop watching because your point is clear already

[@Handlez362]

It may be facing the sun, but Summer and Winter in New York occur during different periods in the earths orbit. So although both are facing the sun in Winter NYC is tilted away from the sun resulting in less energy.

[@naganokumas]

Those in the tropics get two longest days of the year, whereas those outside the tropics only get one.

[@lalagushoru123]

pause the video and move it back to 0:00. then hold the left arrow key for 3 seconds then press down arrow while holding the left key. you can play snakes :D

[@BetterTomorrow4All]

Thanks a lot khan academy

[@EJP177]

I like this. Hope you got some more interesting stuff.

[@deniseshircliffjett1458]

I teach public education, and I love you Khan. When I can't explain it, I know you can! You back me up and I use your videos to re-enforce my own understanding.

[@ajaysan2765]

Amazing Explanation :D

[@darkfox5812]

3:15 We're all human

[@MonsterGagaLee]

Thanks soooo much!!!!!!

[@Ibnchadadalabsi]

You are just great !!!!!!!!!!!!!!!!!!!!!!!!

[@GregoryJByrne]

17:00 you say the axis of the earth changes with the seasons. Best if you use the Polaris and Vega stars to keep orientation.

[@GregoryJByrne]

Keep the sun shining from the same direction it gets confusing when explaining seasons. You only need to change the inclination of the Earth relative to the SUN when explaining the Climate Cycles of the PLANET Glacial Tropical Polaris Vega North stars.

[@Stevesrssrssrs]

Well that explains why spring and fall have the same temperatures, basically, but it doesn't explain why the two seasons are so different from each other.

[@doeswayneexist]

Thanks!

[@pujasaroj5396]

Explain how the tilt of the Earth's axis and the revolution cause variation in the length of day and night Pls ans this question....

[@ghoreyshi]

Thank You Brother :)

[@mauroprovatos]

doesn't the angle at which the sunlight hits the earth matter as well?

[@Oops_Phoenix-9769]

it's actually a 23.5 degree angle

[@callen036]

The Assassins nobody likes a smartass

[@AUDIOSOURCES]

And you proved that my memory is still working.

[@Blink5002]

It is actually 24.432981 degree exact

[@cosmosgato]

I heard that without the moon Earth's rotation would be Helter Shelter

[@SVSQZ]

do you think that this variation of the tilt has anything to do with global warming as well as with the ice ages? i am sure that urbanization affects earths climate change to some extent but could it be also the variation in the angle of earth???

[@shan8sk]

(read the below comment first)NYC gets sunlight both during winter and summer but the temperature during day time in winter is a lot less than that during summer. Temperature is a measure of energy which would mean that energy NYC receives during day time in winter is a lot less than it receives during day time in summer. Why this is so? If NYC is facing the sun (as diagram showed) during daytime both in summer and winter, why should energy it receives be different? This part I don't understand

[@Zaf731]

This video is only fine

[@NasserAlhameli]

Thank you so much! Khan Academy.. Would you please tell me how did they know that the Sun would be away 3 million miles or so @ winter?

[@hanspangan2436]

I have a question. Why does the rotational axis change in 41000 years?

[@NicolasUnger]

True story!

[@officialspock]

Please make this smaller, it's too big

[@erict6927]

Because, as he is drawing up the diagram after he said his initial sentence, he does not want to have absolute silence. This might just be for me but he does not lose my attention that way.

[@ekul3374]

in super slow motion he sounds like bane

[@theburger2550]

do it in slow mo with auto subtitles and see how it looks and soounds

[@theburger2550]

+Griffin Chen ok

[@theburger2550]

+Griffin Chen good

[@oSoloDolo]

@cosmosgato No more Helter Skelter than Mercury's orbit.

[@hoboeden]

does the tilt of the earth have anything to do with the hours on earth

[@Baerchenization]

I think your explanation towards the end is wrong. It is not cooler because the sun light gets absorbed more by passing through more air / atmosphere. The reason it is colder is because due to the tilt, less projected surface is exposed to the sun. That is, with sun right above / at 90 degrees, you get most, and with more inclanation / less projected surface relative to the sun, you get less energy from the sum per surface area and that is what happens in winter.

[@SR-um6zt]

Plane of the ecliptic

[@Imadisneydonk]

No disrespect intended but I just enjoy bringing a little levity into some thing. That being said ..... who else besides me had the urge when he talked about "More Day, Less Night" to stand up and yell, "MORE TASTE, LESS FILLING!!!" (I just hadta say that)

[@최소영-k7m]

I'm martin kim (10) and I'm from korea, I want to meet you khan.

[@angadsiddhu9274]

i thought the orbit was oval shaped ??

[@GregoryJByrne]

The Northern hemisphere is mostly land. land doesn't retain the suns energy like water does. The Southern Hemisphere which is mostly water will point towards teh sun when the axis is pointing at the Vega star again in 26000 yrs. The Northern hemisphere is also Mostly Frozen Co2 which is thawing the more the axis gets closere t oit's 24.5 degrees maximum. The Earths Climate Cycle is Glacial Tropical due to the change in the Tilt of the Axis of the Earth. Northern hemisphere towards the sun when the Polaris star is the north star and away from the sun when the vega star is the north star.

[@zoe-le3pd]

👏🏻👏🏻👏🏻

[@sokra]

I love your videos but you repeat yourself way too much.

[@AmineChM21]

God bless!

[@PopDasKorn]

I thought like this when I was a child, but then in school I learned that it has to do with how close we are to the sun and now I know that this wasn't at all true.

[@roberthalfull]

I came here because of John Stossel.

[@Zeppelinlv2007]

Memory retention.

[@xtearsfallonthefloor]

and "you can imagine"

[@blooberry5738]

What if. The earth 🌏 stops spinning??????????

[@fatihilhan5450]

Add the turkish

[@ankitgupta-vt9vj]

The orbit, shouldn't it be elliptical 😆 just being quirky!

[@ss2616]

Small improvement suggestion: Please be concise, that would increase the effectiveness of explanation. Too long video. Sorry, but couldn't help suggesting this.

[@prasannasubbu6306]

zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz You took so long I fell asleep.

[@Grayscape.]

IS INY ONE GETING A *502* ERORR AT ALL I THANK IT MAY BE DO TO E3 LIVE STREAM

[@AutismGoat]

wow minecraft can help you learn anything

[@xGravit8x]

Why does he repeat every sentence? Why does he repeat every sentence?

[@mauroprovatos]

ah,nvm =]

[@HiRiderII]

@lalagushoru123 Ok, that is freaking awesome.

[@YouKnowUAreRight]

@asfaqqq How cute.

[@idiosyncraticidiott5015]

why do you do that thing you do that's weird? nuff said

[@ryh7070]

The information and knowledge is there but please.... for everyone’s sake just stop repeating every single sentence while you finish your drawings

[@agentsixofhearts7073]

Right now the tilt is 23.5 get a life. lol XD

[@Tripp77]

The "tilt" of Earth's axis is a hoax. If it's true, then how can you explain the North star Polaris never changing it's degrees besides from the regular spin of Earth's day and night rotation. It's this tilt theory was correct then wouldn't Polaris be 23.whatever degrees away on December 21st, than from it's original spot on June 21st? I believe the seasons are caused by something else.

[@bimboblacky]

Because Polaris is CRAZY far away, and therefore local angles R negligible!!!

[@robertwhitten265]

+Powertripp Productions This kind of ignorant post should be deleted from the site.

[@RZI1016]

hahaha. hilarious. hilarious

[@pauldorman7034]

WHAT A MICKEY MOUSE EXPLANATION AND THE DIAGRAMS ARE VERY JUVENILE. HONESTLY HOW CAN YOU PUT THIS OUT TO THE WORLD WHEN THERE ARE SO MANY BETTER PRESENTATIONS. THOSE DIAGRAMS ARE JUST CRAPPY. DUDE TUNE IN TO THE REALITY OF WHAT PEOPLE NEED VISUALLY AND WHAT YOU PRESENT IS NOT THE WAY TO GO. LET PROFESSIONALS TO THE VISUALS.

[@thatguynicky1979]

A lot of time wasted on explaining a concept that ignores our senses and actual data. If you believe this as truth, then it means you have to accept a fantasy instead of reality. Could save us all a lot of time and brain cells if we just accept the fact that the closer the sun is, the hotter it gets. The model Khan has presented denies this. It denies something so utterly fundamental when this model insists that the proximity of Earth doesn't matter for temperature or seasons, but just the angle of earth's axis. How does this make sense? Seriously. How does anyone believe that earth's proximity to the sun doesn't effect its temperature. Yet Mars is cooler than earth because it's farther away, but earth doesn't follow that universal law, bc it's not distance, but angle, that effects temperature...

[@gregorysoutherland6911]

well, we *_could_* have accepted that the earth gets closer but then we'd be wrong cause that's not how it works if it gets closer explain how summer is in december in the southern hemisphere and how december is winter in the northern hemisphere what are you a flat earther? also, on mars, mars doesnt have a tilted orbit, and it doesnt have seasons, your example is invalid