I've noticed the light/dark at the equator
I figured it was a slight differential just to highlight the equatorial line. Never noticed a weather difference, will need to look into that next time I'm in the vicinity...
As far as the map changing, it is to simulate "rigging for red" at dusk and going back to normal lighting at dawn. It serves the purposes of (1) keeping night vision so if you have to go outside or look out without warning you won't be blind (can take 30 minutes or so to adjust vison to dark), and (2) keep some reference for crew as to night/day.
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