英语词汇“mean sun”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

mean sun n. Astronomy an imaginary or hypothetical sun conceived as moving through the sky throughout the year at a constant speed equal to the mean rate of the real sun, used in calculating mean time.

ΚΠ

1765 Philos. Trans. 1764 (Royal Soc.) 54 345 How many minutes and seconds of mean solar time doth the mean sun take to move this distance up to or from the meridian?

1860 R. Main tr. E. F. Brunnow Spherical Astron. III. xx. 81 The mean sun is sometimes before the true sun and sometimes behind it.

1884 Observatory 1 Jan. 3 We make no distinction in our theories between the real motion of the sun in longitude and that of the mean sun.

1975 I. Asimov Eyes on Universe (1976) iii. 46 It became necessary to imagine a ‘mean sun’, an imaginary body that reached the meridian at exactly twenty-four-hour intervals.

1986 P. Duffett-Smith Astron. with your Personal Computer 27 Time reckoned with respect to the mean Sun at Greenwich, sometimes known (ambiguously) as Greenwich Mean Time, is properly called Universal Time.

单词	mean sun
释义	> as lemmas mean sun mean sun n. Astronomy an imaginary or hypothetical sun conceived as moving through the sky throughout the year at a constant speed equal to the mean rate of the real sun, used in calculating mean time. ΚΠ 1765 Philos. Trans. 1764 (Royal Soc.) 54 345 How many minutes and seconds of mean solar time doth the mean sun take to move this distance up to or from the meridian? 1860 R. Main tr. E. F. Brunnow Spherical Astron. III. xx. 81 The mean sun is sometimes before the true sun and sometimes behind it. 1884 Observatory 1 Jan. 3 We make no distinction in our theories between the real motion of the sun in longitude and that of the mean sun. 1975 I. Asimov Eyes on Universe (1976) iii. 46 It became necessary to imagine a ‘mean sun’, an imaginary body that reached the meridian at exactly twenty-four-hour intervals. 1986 P. Duffett-Smith Astron. with your Personal Computer 27 Time reckoned with respect to the mean Sun at Greenwich, sometimes known (ambiguously) as Greenwich Mean Time, is properly called Universal Time. extracted from meanadj.² < as lemmas
随便看	thorn-wall thorn-wood thorn-wounded thorn-wreathed thornacacia thornapple thornback thornback crab thornback dog thornback ray thornback skate thornbackly thornbacks thornbeak thornbearer thornbed thornberry thornbill thornbilles thornbills thornbird thornbit thornbound thornbroom thornbush

> as lemmas