Sun and Moon live wallpaper

this app visualises sun earth moon model as a 24 hour clock
press the hour,day etc to change the date/time

also as live wallpaper

Southern Hemisphere - the earth rotates clockwise

Northern Hemisphere - the earth rotates counter clockwise

Sun light and Moon light increase when the Sun\Moon are high in the sky

Shows Sun Rise and Set
Shows Moon Rise and Set

Press the center of the earth for Virtual Mode!

This App can help you guess the time by the moon.
For example:

The full Moon - Rises at sunset , is high in the sky at midnight, and sets at sunrise.

First Quarter moon - Rises at Noon, is high in the sky at sunset and sets at Midnight.

Last Quarter moon - Rises in Midnight, is in the sky at sunrise and sets at noon.

So if the moon is full and between Rise and high in the sky (6 hours) - the hour will be around 21:00.

Guessing the time this way is fun, but please note it will not be completely accurate.

You should take your time zone into consideration, as well as the daylight savings time offset in your area.