If you've been to the official forums lately, you may know that I've formulated some new, realistic sky colours for Earth and
Mars. Some no longer visit the official forums due to "reasons". So for their sake, I'm posting it here.
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Earth Sky
To get a realistic azure colour, change the AtmColor field in Earth.cfg to
AtmColor0 = 0.0 0.55 1.0
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Mars Sky

Change the "AtmColor0" and "AtmHazeColor" fields in Mars.cfg so that they are as shown:
AtmColor0 = 0.823 0.658 0.501
AtmHazeColor = 0.823 0.658 0.501