| 单词 | meridian mark |
| 释义 | > as lemmasmeridian mark meridian mark n. Astronomy a mark fixed due north or due south of an astronomical instrument, by means of which the instrument is aligned with the local meridian. ΚΠ 1849 J. F. W. Herschel Outl. Astron. iii. 114 Thus also a meridian line may be drawn and a meridian mark erected. 1867 D. Lardner & E. Dunkin Handbk. Astron. (ed. 3) i. 17 The entire instrument therefore must be shifted round, until the meridian mark coincides with the middle wire. 1885 Sidereal Messenger 3 301 A mire or meridian mark, eighty feet distant. 1983 C. A. Murray Vectorial Astrometry ix. 228 Diurnal variation of temperature can introduce changes in β3 which can..be monitored by observations of distant meridian marks. < 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。