Stellar and planetary contributions to the illumination of our prototype moon as a function of orbital phase φps. Tiny dots label the thermal flux from the planet (ft), normal dots the reflected stellar light from the planet (fr), dashes the stellar light (), and the solid line is their sum. The panels depict different longitudes and latitudes on the moon's surface. The upper left panel is for the subplanetary point, the upper right 45° counterclockwise along the equator, the lower left panel shows a position 90° counterclockwise from the subplanetary point, and the lower right is the antiplanetary point.