Everyone in 2020: "My teacher is making me watch this." Me: Here because I was curious. Lol

I was going to include a description and animations of how to measure angular height of the Sun, the way we do it in my classes, but it added too much to the script.

I would have liked the title "Reasons for seasons".

I've lived in a tropical country almost my whole life and it's the first time I'm experiencing the change of seasons!

Im from the philippines.. we only have 2 seasons. (Wet and dry)

I think the most useful part of this video, and the one I am likely to come back to over and over again for my students, is the brief sequence that shows the shift in point of view of our orbit around the Sun, and how it appears elongated from one angle and nearly circular from another.

People are so unaware about this when its one of those topics that everybody should know

Best Lesson, Best Narration, Best Animation Illustration... Concept went SO SIMPLE....

Her: There's still icebergs in the North Pole. Me: Well not for long

I think the animator, Marc Christoforidis, did an amazing job!

Sunlight intensity is formulated as: I = Io sin a Where: Io = Max intensity (1000 W/m^2) a = Sun's angular altitude 1️⃣When the sun is directly overhead you'll get full blast of sunlight. 2️⃣When the sun is at 60° above the horizon you'll get 86.6% of sunlight compared to that of directly overhead sun. 3️⃣When the sun is at 30° above the horizon you'll get half as much sunlight compared to that of directly overhead sun. 4️⃣If you live in, say, Fairbanks, AK during the winter, the sun never goes above 5° above the horizon. In this case you'll get only 8.7% sunlight compared to if you live in Pontianak, Indonesia during the equinox!

Outstanding video and your narrative is superb. You're a natural! Great information, very engaging and interesting and your intonation and delivery is really engaging. Well done!

GREAT job of making a complicated subject understandable!

as an 25 year old i never new this, very good info.

Very nicely illustrated, explained, and spoken.

Crystal clear explanation! Great animation!!

Yes! Whenever my students and I are reviewing the science behind the formation of the Earth and the evolution of the atmosphere, it becomes clear how amazing it is that life is here on this planet!

I had to watch it twice, just to catch all of the information. Thanks for this amazing upload!

I’m taking notes for science class rn

Sometimes TEDEd videos don't answer the question posed in the title, but I feel this video addressed the question very well.

Eat that, flat-earthers.

The place where I live there is only two seasons, wet summer and dry summer, and the number of hours between day and night equal in a day all the year. Happy December Solstice everyone 🎉

I love this question! I wonder the same thing...is it possible to determine the answer to this question (and control for all other climate variables)? Maybe average temperature at a given latitude? I am intrigued!

The four seasons made some great records

Ok, get this. This has graphical video clips and very summarized which makes it easier to understand.

I am passionate about these particular concepts because in my personal experience I have found that a lot of people (students and adults) know the answer to the question "what is the reason for the seasons?", but fail to be able to answer questions that examine the issue more critically or predict certain phenomena accurately. For instance, being able to provide evidence to prove that distance from the Sun is not the answer...or provide reasoning for what would happen without the tilt.

This portion was complicated until i watched this. Thanks ☺️

Thanks for the well put together video!

I am so grateful for active participants in the discussion that help to CLARIFY and don't muddle things: thanks for your comments!

i never experienced snow

This helped a lot for my science work!

I have 2 and 5. In Australia,its bursting with flowers in September and October.

Hey Adam! Thanks for that...I had a link to the harvard video in the original post on my blog--so memorable. My experiences with ARIES at Harvard definitely were the inspiration for this.

Amazing animations, great job!

Great video!! I would've liked it if you had explained why the axial tilt has a greater influence on our seasons than our orbit's eccentricity. It's not obvious to a lot of people, especially after telling them that our distance from the Sun varies by about 5,000,000 kms, which is a much greater change in distance from the Sun than what any location gets from the tilt.

Great class!

Believe me, most people don't. Fortunately, the most important thing is not that you didn't know before, but that you know now and you had the desire to go out of your way to learn.

Well, seasons kinda make an exception in really appearing when you live in a country nearly in 0º0'0'' Lat, as long as somebody can have a heavy storm day in December or July, a heatwave in November or April, and a windy day to throw trees down in February or August. Sometimes even the three of them in the same day. Although, the "seasons" can be called Hot and Wet, more than Summer and Winter. Point for living in Ecuador, I guess?

Wow this one interesting for summer time in Northern hemisphere & for winter time in Southern hemisphere.

Just completely had to make me re-think everything... This is amazing! *The more you know

SHOUT OUT MR.BASQUES

Very good explanation and graphics.

Beatiful work!

Marc did some great work, here, I totally agree!

This was extremely helpful

The observed angle between the observer, horizon and sun. Flat or low describes situations as in dusk or dawn, high means e.g. noon time in summer.

The animation was very narrative, thanks

Oh of course, absolutely. On second thought what I originally thought was a good idea (a zoom in/out on Earth [real size] then scaling up with a "not to scale" message or something) is meaningless because that is not the point of this talk. Great talk and animation!

Hey Mr. Shoop! Way to keep the conversation on-topic and relevant. Flumeca!

Thank you, You ppl have cleared many doubts of me

Very clear explanation!

Best title name I've seen in a while.

1:09 She says that it looks more like a circle, but it is "technically" elliptical.

I used to be obsessed with this kind of stuff in high school! It was like spring is analogized to sunrise and autumn to sunset! Winter is nighttime! Summer is noontime!

2:19 Actually, the Earth's axis of rotation is wobbly a bit which is known as the chandler wobble or a free nutation.

Aren't the planets supposed to be orbiting counter-clockwise? On the Johannes Kepler frame?

We got 2 ads while watching this and my professer really moves like a snail + turtle when skipping the add

I'm Saudi and we just have summer 😂😂😂

beautiful.

Can anybody explain why the tilt is in different direction in different videos?

It can be mentioned 'because sunrays are almost tangential to the north pole, Raman effect is more and more rays are refracted away'

thanks I needed this - science class taught me nothing today 💀

I'm bit confused at 2:10. Is the earth tilt image animated correctly.? I've studied that earth axially tilted 23.5 degrees towards Northeast. But here it tilted towards Northwest.. someone explain

What I never got was how come at night it doesn't turn to winter. If I were to heat a rock and stop heating it, after just a few hours it would be stone cold.

This is very specific to the mid and high latitudes. Many places in the tropics and sub-tropics have rainy seasons. Bonus question, even though the sun is highest on the summer solstice, the highest temperatures on average occur 4-6 weeks later, and the coldest winter temperatures on average occur 4-6 weeks after the winter solstice, why?

hands down the best video on seasons

can someone enlighten me the difference between temperate climate and continental climate?

One thing I am curious about is this: The Earth is closest to the Sun is January, the southern hemisphere's summer. Due to this, are southern hemisphere summers slightly warmer than northern hemisphere summers of a comparable time and place? And does the opposite hold true? Are southern winters colder than northern ones as the Earth is (one would assume) the furthest point from the sun?

Excellent

excellent explanation

Beautiful video

I was born at the equator on Spring Equinox in East Africa. Unfortunately I don't live there anymore. I agree with you it's "Hot and Dry" or "Hot and Wet" but this varies depending on topography for example highlands are cold during winter season.

thank for this!

Very informative! Keep up the good work. Thanks you :)

Right! The orbit is elliptical, but to the human eye, it seems circular. "Eccentricity" is a calculation that measures how elongated an ellipse is, and Earth's orbit is only very slightly elliptical: .017 eccentricity.

Nice . Thank you.

great video, thanks!

You're right this video is helpful

New Zealand!

this video is very helpful

Thanks!

Thank you

thanks

I have a question, though...do you think that because it is in a textbook that it 1. makes sense 2. means that all children and adults understand it?

Great video

2:17 That arrow should start from where the top would be, not from the South Pole. Also, *technically* the axis doesn't "always" point in the same direction. It just takes thousands of years to shift to the point where it's noticeable.

That's the ultimate goal!

I'll be playing this video for my 6th graders in our Earth Science class today! Thank you for posting it!

Thanks for that comment, TheDigitalStone. Just because we're American doesn't mean we're stupid, but if you look at how the typical American student performs on international math and science tests, you get the idea that our math and science education is not top-notch. It's so important to interest gifted young people in becoming educators for that very reason!

why is the label of 23.5 degrees not labeling the correct angle??

my question to australia/new zealand is, does it blow your minds to think of christmas as a time of snow and winter as my mind is blown to think of christmas taking place in the summer?

What I don´t understand is, why and how the tilt does conservate throughout all the orbit, and does not displace its spin?

i'm surprised that there are people who didn't know this...

2x speed and subtitles are a life saver

beautiful

Really great

The axis always pointed in the same direction. If the sun tilts towards the sun and away during the season how can the axis always point in the same direction.

my teacher is making me watch this for distance learning. 2020-2021

This video is helpful

Not getting it