I googled it and it came back that it is because the sunlight travels through dense atmosphere, please can someone explain what that is?
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The atmosphere is all the gas surrounding the earth, including the air you breath. You’ve probably heard of greenhouse gasses. Those are in the atmosphere!
The distance through the atmosphere the light must travel to you while the sun is directly overhead (essentially the thickness of the atmosphere) is much shorter than the distance when the sun is at the horizon. The atmosphere absorbs some of the energy as the light travels through it. Longer distance, less energy reaching you.
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