Milankovitch cycles precession and obliquity | Cosmology & Astronomy | Khan Academy
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How changes in Earth's rotation can effect Earth's seasons and climate. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/earth-title-topic/v/precession-causing-perihelion-to-happen-later?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/earth-title-topic/v/are-southern-hemisphere-seasons-more-severe?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Comments
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Wish he connected this to our current Milankovitch cycle, and its ties to global warming.
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Who is Khan? and why does this guy know so much about every subject? Biology, chemistry, math, geology...amazing
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This is too complicated
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41000 years? Really. The axis was about 26.5 degrees only 4330 years ago from an initial value of 5.1 degrees. An asteroid can ruin your whole day - and smarty-pants theory.
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Does nutation cause obliquity?
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@Neueregel:
astrology does consider the precession of the equinoxes. The problem is that modern people think that astrology is some kind of fortune-telling. Actually, it has more in common with modern psychology and sociology. Do they "work", or are they just "nonsensical social constructs"?
Btw. the Great Year is ~25920 years. It's not an "exact" number as the angle tilts between ~22-24°, but it's used in most calculations. -
Khan academy, crushing it since 06
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Thanks dude. I finally got my head around this...
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The Great Year of precession, is around 25800 years. That's why astrology doesn't work. After 2000+ years, now the Zodiacal circle has shifted around 1/12 of the full circle of the Ecliptical, so all the astrological signs are not only nonsensical social constructs but also falsely depicted and wrongly calculated in accordance to the true solar motion over the respective zodiacal ecliptical constellations in the celestial globe.
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One thing has always irritated me about the nature of a teacher expressing knowledge. If that subject is not clearly expressed and a person's desire to feel intelligent stands in the way of that message, the powerful essential ingrediants of the magic you describe is lost.
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gooodddd..........
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Beware when it reach 24.5 deg Volcanoes will erupt!!!
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So glad I came to this vid, i have an exam in an hour's time and I understood it better in less than 13 min, than my lecturer spending an hour explaining it... Thanks! :) The top example really helps!
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And Al Gore thinks that seasons are caused by the distance from the Sun.
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Alright ma niggas, we be learnin bout that Milakovitch cycle and we on its tip for the boys. How many times I gotta tell yall we doin it big. These rotations be makin my dogg roll around on the floor he actually loves it haha. How many times are you gonna roll around lol how manytimes. I asked him twice, he never answered
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Paint nigga.
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weird top comments are weird
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funny all the dragon myths, like quetzalcoatl, since the pole star changes over time, tracing a circle around the constellation draco, over 26k years. maybe the mayans and egyptians were trying to warn that every time precession completes a circle something big happens to earth. like a severe change in tilt, a new equator, or a change in rotation. guess we'll see
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You should use universe sandbox :D
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Thank you! I took a college astronomy course and left unable to visualize precession. Now in about twelve minutes you've put my college instructor to shame. Awesome.
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