The "double night" of Prometheus

Caption NASA originale:"Saturn's moon Prometheus is seen here emerging from the darkness of Saturn's shadow. This shepherd moon, like most of Saturn's moons, always keeps the same face pointing toward the Planet. An observer on the moon's Saturn-facing side would never see the Sun directly overhead at noon, for the Planet would always be in the way (creating an eclipse). Instead, the Sun would rise in the east, but as noon approached the eclipse would begin, bringing darkness a second time. Night comes twice on Prometheus.

This image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 3, 2005, at a distance of approx. 2,1 MKM (such as 1,3 MMs) from Saturn. The image scale is 13 Km (such as 8 miles) per pixel".