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Lambert (lunar crater)
Lambert is a lunar impact crater on the southern half of the Mare Imbrium basin. It lies to the east and somewhat south of the slightly larger crater Timocharis. To the south is the smaller Pytheas, and some distance to the west-southwest is Euler.
The crater is relatively easy to locate due to its isolated position on the mare. It has an outer rampart, terraced inner walls, and a rough interior that has a comparable albedo to its surroundings. Instead of a central peak, a small craterler lies at the midpoint of the interior.
Just to the south of Lambert's ramparts is the lava-covered rim of a crater that is almost completely covered by the mare. The diameter of this ghost crater is slightly larger than Lambert, but it is difficult to spot except when the Sun is at a very low angle. The feature is designated Lambert R.
==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 Lambert.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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