Currently the stars plugin only displays the sun. 

We would like to show the moon as well.

The latest version of the astrolib provides means to calculate moon and planet positions.

Positions for planets and the moon are given in "right ascension" (equals longitude except that it is usually measured in 0 - 24 hours instead of -180-180 degs) and "declination" (equals latitude).

Please investigate how to get the moon position using astrolib (we use the center of the earth as a reference). Then draw it onto the sky. For the very first implementation you can draw a white circle.