Reiner Gamma Lunar Swirl

Reiner Gamma Lunar Swirl August 3 - Oceanus Procellarum is the large, dark mare region near the western (left-hand) limb of the moon. The Reiner Gamma Lunar Swirl is a small, high-albedo area located just inside the western edge of Procellarum, due north of the dark crater Grimaldi and due west of the bright, rayed crater Kepler. It is best seen a night or two after the moon's full phase. The 18 mile or 30 km diameter crater Reiner is located east-southeast of Reiner Gamma.