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Theaetetus is a lunar impact crater that is located to the southeast of Cassini crater near the eastern edge of Mare Imbrium. It lies just to the west of the Montes Caucasus range, which forms the eastern shore of the mare. To the southwest is the prominent Aristillus crater. The rim of Theaetetus is distinctly polygonal in shape, with a slight rounding at the vertices. There is a low outer rampart and a slight central rise on the crater floor, which is offset to the northeast of the crater mid-point. The interior is otherwise relatively featureless. This crater has been noted in the past as a site of possible transient lunar phenomena. In 1902, a white cloud was observed to briefly form in the vicinity of the crater. Other observers, including Patrick Moore and W. H. Pickering, have also noted unusual appearances in this area.
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