[crater] Kapetyn is a lunar impact crater that is near the eastern limb of the Moon, to the west of the crater La Pérouse. West of Kapetyn is the slightly smaller Barkla, and farther to the west-northwest is the prominent Langrenus. This crater is circular in shape, although it appears oval when viewed from the Earth due to foreshortening....
Found on
http://en.wikipedia.org/wiki/Kapteyn_(crater)
1851–1922, Dutch astronomer.
Found on
https://www.infoplease.com/dictionary/kapteyn
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