Bruce Murray Space Image Library
The "dark side" of Saturn
Sunlight is incident on the south (bottom) side of the rings, so the strongest illumination from ringshine is on the southern hemisphere of Saturn. The reflection goes to a minimum near the equator, where the effective area of the rings goes to zero (because they are so thin). There is also weaker ringshine lightening the northern hemisphere night side because the rings are partially transparent; light there has been scattered through the rings and bounces northward to Saturn. At the extreme left of the image daylight is illuminating Saturn's globe, and the rings casting shadows onto its blue northern hemisphere. Three moons are visible in this view: clockwise from the top, they are Enceladus, Epimetheus, and Mimas.