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Horrocks (crater)
Horrocks is a lunar impact crater located entirely within the eroded northeast rim of the much larger walled plain Hipparchus. To the south of Horrocks are the craters Halley and Hind and Rhaeticus to the north. Gyldén and Saunder lie to the west and east, respectively. The crater Horrocks was named after the 17th-century English astronomer Jeremiah Horrocks.〔''Autostar Suite Astronomer Edition''. CD-ROM. Meade, April 2006.〕
The rim of Horrocks is somewhat irregular and polygonal, particularly with an outward protrusion on the eastern rim. It has a small outer rampart. The inner wall is slumped, particularly along the northwest where it forms a heap of talus. The interior floor is uneven, and it has a central mountain and hills. The crater is approximately 30 kilometers in diameter and 3 kilometers deep. It is from the Eratosthenian period, which lasted from 3.2 to 1.1 billion years ago.〔
==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 Horrocks.
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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