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Fermat (crater) : ウィキペディア英語版 | Fermat (crater)
Fermat is a lunar impact crater located to the west of the Rupes Altai escarpment. To the west-southwest is the larger crater Sacrobosco, and to the southwest is the irregular Pons. It is 39 kilometers in diameter and two kilometers deep.〔''Autostar Suite Astronomer Edition''. CD-ROM. Meade, April 2006.〕 The rim of Fermat is worn and somewhat irregular, but still possesses an outer rampart. The north rim is indented by a double crater formation that includes Fermat A. The floor is relatively flat and does not have a central rise. The crater is from the Pre-Imbrian period, 4.55 to 3.85 billion years ago.〔 It is named for 17th century French mathematician Pierre de Fermat.〔 ==Satellite craters== By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Fermat.
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