Summer of Math Exposition

Presented by 3Blue1Brown 3blue1brown

Lunar Eclipse september 07, 2025

Audience:

This video is about a lunar eclipse, in which I've tried to answer the following questions: 🔹What really causes a lunar eclipse (and why it’s different from a solar one) 🔹 Why some eclipses are partial and why some last longer than others 🔹 Why the Moon turns red instead of disappearing — the science of Earth’s atmosphere scattering light Although this video isn't very mathematically intensive, I have made this to take my first step towards my objective of quality education for free. I aim to bring an international standard of education in my native language, Urdu. Quality education is almost nonexistent in the Urdu language, and I want to fill that gap. One more thing that while I was busy making this video, my state was flooding with monsoon rains and frequent electricity shutdowns. I hope you will enjoy this.


Analytics

6 Overall score*
77 Rank
11 Votes
8 Comments

Comments

7.5

I really like this way of explaining eclipse. It was short , compact and very beautiful. The animations made everything every clear and all were out of basic assumptions . You have taken a good approach of starting with questions and answering them. Its almost perfect but I think it could have been better if you have added more about eclipses. The video was short , thats good. But I feel like that part should be the one which attracts and keeps the audience into the video. Later you could have added more details about eclipses and the best thing you can relate the phenomena to other things like how you have done with the atmospheric refraction, compared to evening sky . Best of Luck

7.5

Nicely done, not outstanding but definitely the best video i got to judge so far

4.5

The video is put together well, but I’m not sure whether it adds much on top of existing resources.

5

It was an ok video, but nothing very special. I had heard them quite a few time.

8.5

Great video. You are clear with the three questions you ask and answer. Visuals are great as well.

6

I found the audio hard to understand at times. The graphics were good, but I wish it had not ended so abruptly. Maybe a final word about this is why the moon looks so rusty red when the earth’s shadow does not completely reach the moon, when this might occur, how often this might occur, why 80% of earth’s population would see it on Sept. 7 2025 and when the next such occurrences would occur. Good explanation of why the moon appears rusty red rather than just grayed in shadow.

3

I liked the animations of how the Sun, Earth, and Moon interact. It made it clearer to visualize how the shadows lead to different kinds of eclipses.

5.8

The outline questions presented in the beginning offered good guidance and motivation to continue viewing. They also allowed me to predict what was going to happen next which was nice.

The music was a good touch.

The video ties into real events that the viewer will experience. There’s also a date presented incase the viewer wants to watch for the event or had seen it.

There’s not really any background needed to enjoy the content or learn from it.

This feels like something that a teacher might play in class for a unit on moon phases, solar eclipses, etc.

The exact style of the video doesn’t feel too unique or memorable but the information is well presented and logical.

“Reminiscent of Sebastian Lague” -Cool Math Person