Automatic change of brightness of the display.
1. latest version gmaptz
2
[Only registered and activated users can see links. ]
3
[Only registered and activated users can see links. ]

it works here so:
For half an hour to sunset brightness of the screen makes 100%
After that brightness starts decreasing from 100% to 60%
At the time of a sunset the display will pass into the night mode (dark)
After that brightness will decrease further with 60 to 20% within half an hour after a sunset.
During sunrise in reverse order

transient period of change of brightness of the display 1 hour on a sunset and at sunrise.

P.s. Brightness! Not a color Mode!