Conversation so far:
how big is the sun in mercury's sky
The angular diameter of the Sun from Mercury is about 1.4 degrees.
how big is the sun in mars' sky
The Sun as seen from Mars appears to be five-eighths the angular diameter as seen from Earth, 0.35 degrees.
what color is the sky on mars
During the Martian day, the sky is a butterscotch color.
what color is the sky on mars at sunset
Around sunset and sunrise, the Martian sky is rose in color, but in the vicinity of the setting Sun it is blue.

Question: how long is a solar day
Self-contained rewrite: how long is a solar day on mars