How can a sunrise light up the bottom of clouds?

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How can a sunrise light up the bottom of clouds?
Hey yall. I consider myself a globe denier without a doubt, but every now and then I have things pointed out to me that I don’t have an explanation for.

How can a sunrise light up the bottom of clouds if it is always above them?

I’m sure someone here has an explanation for this phenomena. My hunch is that it has to do with the laws of perspective, and is tied to the same reason why the sun disappears behind the sunset. The sun appears from our observation to sink into the horizon as …