Why does the sun seem to move faster during sunrise and sunset, but not at any other time of day?
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You can see it’s speed relative to the horizon when it is close to the horizon. You have no frame of reference when it is in the middle of the sky. The same reason the moon seems bigger when it is close to the horizon.
What you effectively see when the sun moves through the sky, is the rotation of the earth. At midday the sun is closest to you. Imagine watching at the side of a clock laying down with the 12h mark right in front of you. If you draw a line at every hour mark you’ll see that because it is round, the lines of the 9-10 hours and 2-3 hours seem closer together than the lines of the 11-12-1 marks. You travel constant but seem to move faster at the edges. If you shine a lazer from the position at the side of the clock or the earth and you move it in a constant movement from left to right it the distance it travels on the sphere is larger than at the center
The horizon gives an easy visual reference with which to gage its progress. Much easier than in a clear sky at noon. You can also lay an object next to a shadow and see how fast it’s moving that way.
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