2 () posted 198 days ago by Jim_donald 198 days ago by Jim_donald +4 / -3 12 comments share 12 comments share save hide report block hide replies
The author of this video apparently doesnt understand the difference between the penumbra and umbra.
https://en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra
I know, math and spatial reasoning stuff is hard.