A special sign on the moon:

And God gave the Sun to rule the day and the moon to rule the night; and the stars in the sky.  These are used to determine the days, months,and years; also used for signs.

Using Google Earth and then click on the Moon (NASA  aerial view).

Plug in 19°  58´  48.31 N  ----  21°  11´  35.57 E

And zoom in really close for the sign.