Originally: motion intrinsic to a celestial object. In later use: spec. the apparent angular motion of a star or other object across the celestial…
| 单词 | θ767 |
| 释义 | the world > the universe > star > stellar motion > [noun] (13) proper motion1561 Originally: motion intrinsic to a celestial object. In later use: spec. the apparent angular motion of a star or other object across the celestial… star drift1829 (a) chiefly poetic a mass of stars; (b) Astronomy proper motion common to a group of stars (cf. star streaming n.); (also) motion of a star across… star stream1844 †(a) a narrow band of the sky or space that is rich in stars (obsolete); (b) Astronomy a large group of stars having similar proper motions; esp.… motus peculiaris1890 Peculiar motion (of a star) (see peculiar, adj. 2c). Cf. also proper motion, n. star streaming1905 the phenomenon (explained by galactic rotation) by which stars in the Milky Way Galaxy tend broadly to have proper motions in one or other of two… drift1906 Astronomy. Originally: any group of stars having a random distribution of velocities; usually applied to a group of stars with an apparent systematic… Subcategories:— velocity (2) — highest point (2) — disappearance in sun's rays (1) — passage (1) — meeting (1) |
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