Nineteen Day Old Moon‡

Tonight's Gibbous Moon will be visible during the late evening and through to dawn, at the zenith during the last hours of night, a few hours before dawn.


Key Features to Observe Tonight

Tonight the terminator has swept past the eastern edge of Mare Tranquillitatis and it lies in the dark. To the north lies the prominent crater Hercules, in stark isolation, with its companion Atlas already hidden in the nightside.

South of Mare Tranquillitatis, the fragmentary bright crater ring of Gutenberg marks the southern end of what remains to be seen of Mare Fecunditatis. Gutenberg also marks the northern end of the tonight's residual of the Pyrenees Mountains, along the eastern edge of Mare Nectaris.

South of Mare Nectaris, at a distance about equal to its diameter, is the crater Piccolomini, with its prominent central peak. About the same distance again, close to the terminator, are two more interesting craters: Metius and Fabricius. Fabricius is situated the northeastern quadrant of the older and larger walled plain crater, Janssen. Its eroded outline is clearly seen with the Sun at this low angle of incidence.


‡with permission from Lunar Discoverer User's Manual by Robert Duvall, 2013