| 单词 | relative proper motion |
| 释义 | > as lemmasrelative proper motion relative proper motion n. Astronomy the proper motion of a star or other celestial object relative to a set of reference points. ΚΠ 1784 W. Herschel in Philos. Trans. 1783 (Royal Soc.) 73 262 No observations can be so conveniently made to ascertain small relative proper motions among the fixed stars. 1845 Monthly Notices Royal Astron. Soc. 1843–5 6 139 The relative proper motion of Sirius in right ascension. 1922 H. S. Jones Gen. Astron. xii. 312 The variation in the relative distances between the two exposures will be due partly..to the relative proper motions of the stars. 2004 J. Kovalevsky & P. K. Seidelmann Fund. Astron. xii. 301 The best that can be determined are the relative proper motions of the components [of a multiple star]. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。