That video you linked doesn't even give a working explanation of sunsets.
There are a lot of things to cover, that's an introduction video.
Sunsets are simple. The sun is local and is moving away from you.
Then sunsets would not be possible.And, instead of a disk sinking below the horizon, the sun would shrink to a point, then circle around low in the sky before growing again.
How far did you say the sun was above the earth? How big is it?
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