To adjust the darkness and brightness of dusk and dawn textures, add the following command lines under GRAPHICS section.
[GRAPHICS]
DAY_THRESHOLD=n (default=32768)
NIGHT_THRESHOLD=n (deafult=4096)
Acceptable values are 0 – 65535, where 0 is complete darkness and 65535 is brightness at noon in the summer. Adjust and test for the favorite values.
FS Times 
Hi Tom, i need help on this post. Where do you find the [GRAPHICS] section? is it on a cfg file or something?
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It’s in the fsx.CFG file. It could be in this directory — C:\Users\\AppData\Roaming\Microsoft\FSX
Tom
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