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Theaetetus is a lunar 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 is shape, with a slight rounding at the vertices. There is a low outer rampart and a slight central rise on the crater floor.
This crater has been noted in the past as a sight of possible transient lunar phenomenon. In 1902, a white cloud was observed to briefly form in the vicinity of the crater. Other observes, including Patrick Moore and W. H. Pickering have also noted unusual appearances in this area.
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