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| the polestar or North Star, a star of the second magnitude close to the north pole of the heavens, in the constellation Ursa Minor |
| any of various groups of stars to which definite names have been given and the section of the heavens occupied by such a group, such as Ursa Major, Andromeda |
| anomalistic month | |
| —n | |
| the interval between two successive passages of the moon through perigee; 27.55455 days | |