| 单词 | mean noon |
| 释义 | > as lemmasmean noon mean noon n. Astronomy noon as calculated by the motion of the mean sun; the moment at which the centre of the mean sun crosses either the local or the standard meridian. ΚΠ 1750 J. Robertson tr. N. L. de La Caille Elements Astron. ii. i. 149 There is a considerable difference between the true noon..and the mean noon, or the instant the sun's centre would have passed the meridian, if its motion in right ascension was uniform. 1839 H. Moseley Astron. xxvi. 99 About the equinox the time of true noon precedes the time of mean noon. 1971 W. M. Smart Text-bk. Spherical Astron. (ed. 5) ii. 43 When the mean sun is on the observer's meridian, it is local mean noon there. < as lemmas |
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