| 单词 | mean solar time |
| 释义 | > as lemmasmean solar time mean solar time n. Astronomy time as calculated by the motion of the mean sun (corresponding to standard clock time at the meridian that defines a time zone). ΚΠ 1765 Philos. Trans. 1764 (Royal Soc.) 54 344 There are three different kinds of time used by astronomers, sidereal time, apparent solar time, and mean solar time. 1854 H. Moseley Lect. Astron. (ed. 4) xxi. 96 The difference between true and mean solar time..is called the equation of time. 1959 A. N. Spitz & F. Gaynor Dict. Astron. 405 Mean solar time or civil time is the average sun time... It is the basis of all ordinary measurements of time. 1992 S. P. Maran Astron. & Astrophysics Encycl. 930/2 Clocks that were designed specifically for keeping sidereal or mean solar time were called regulators, because they provided the standard time by which other clocks were regulated. < as lemmas |
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