Darwin (lunar crater)
|Colongitude||70° at sunrise|
|Eponym||Charles R. Darwin|
Darwin is a lunar crater of the type categorised as a walled plain. It lies in the southeastern part of the Moon, and is sufficiently close to the limb to appear significantly foreshortened when viewed from the Earth. Attached to its southern rim is Lamarck. To the northeast is the dark-floored crater Crüger.
The outer rim of this formation has been significantly disintegrated by the nearby impacts. The southern and northern parts of the rim in particular are all but destroyed. The eastern rim is somewhat worn but intact, and several small craters lie along the southwestern rim. The satellite crater Darwin B, a fairly large formation with a diameter of 56 kilometers, is attached to the outer western rim.
Parts of the interior floor of Darwin have been resurfaced, possibly by lava or fall-back ejecta, and a system of rilles cut across the northern part of the floor, crossing the eastern rim and continuing to the southeast. These rilles are designated the Rimae Darwin, and they stretch for a distance of about 280 kilometers. To the east of Darwin, this system of rilles crosses Rima Sirsalis, a wide rille that follows a line to the northeast.
The southern floor of Darwin is only rough level, irregular surface features and several small craterlets. There is an uneven sloping region in the northeast part of the floor, created by ejecta from the Orientale basin impact that struck the eastern rim. In the western floor is a large, low, somewhat irregular dome, one of the few such features not found on a mare. There is also the remnant of a small crater at the southern end of the floor.
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Darwin.
|A||21.8° S||73.0° W||24 km|
|B||19.9° S||72.2° W||56 km|
|C||20.5° S||71.0° W||16 km|
|F||21.0° S||71.0° W||18 km|
|G||21.5° S||70.7° W||17 km|
|H||21.0° S||68.8° W||30 km|
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