twenty-six day moon

In this light, the contrast between the dark Maria and the bright uplands is slight. Near the centre of the limb, class 5 Grimaldi still shows as a somewhat darker patch, however. The smooth area to its east and stretching northwards is what remains of the Oceanus Procellarum. Just under half way along a straight line from Grimaldi to the northern cusp is class 1 Aristarchus, which now stands out because of its dark-shadowed interior rather than its brilliant ejecta.

To the south-east of Grimaldi by twice its length are the contrasting class 5 pair of light Hansteen and dark Billy (the latter being further from Grimaldi and easier to spot). To the south-south-east, almost as far again, is the larger class 3 Mersenius, and continuing in that same direction at a further twice that distance is the huge class 5 walled plain Schickard with its unusual convex floor.

Just south-east of Schickard is the curious "footprint" of Nasmyth (the heel) and Phocylides, and beyond that, separated by about the length of Schickard and close to the terminator, the first of a chain of almost identical class 1 craters: Zucchius, then Bettinus and finally Kircher.