The sun disappears when Lighting.ClockTime is either bigger or equal to 18, or smaller or equal to 6. This only happens if there’s an Atmosphere and a Sky present.
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Intel(R) Pentium(R) @ 3.0 GHZ, 4 GB, GeForce GT 620
I thought I was crazy when I first started really taking note of this strange behaviour, and only now does it make sense that something like Atmosphere is causing it. I never recall the Sun image to ever just disappear, and the moon randomly generating light when it hit a specific time. It just looks really unpolished and totally ruins the immersion or realism any game tries to portray with it’s lighting. Especially with mechanics that really try to sell that realism, such as Day/Night cycles.