A crater on the Moon near Kit's favorite place, in the Lunar Caucasus chain. The crater was named for the Greek astronomer Kalippos of Kyzikos, who lived around 330 BC.

The outer rim of Calippus is somewhat irregular; there are outward bulges to the northeast, and also on the west side, where there is an interior shelf of slumped material. The exterior has a slight rampart, which is surrounded by the rugged terrain of the Caucasus mountain range. The sharp-sided interior walls contain a rough, irregular floor which is nonetheless fairly flat by lunar crater standards. Southeast of the crater, on the edge of Mare Serenitatis, is an arcing rille designated Rima Callipus. This cleft curves around and stretches northeast for about 40 kilometers.

Kit probably chose Calippus and this end of the Caucasians as a hangout because of their closeness to the Sea of Tranquillity and the future Lunar Heritage Area. (HW)

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