| 单词 | semi-diurnal arc |
| 释义 | > as lemmassemi-diurnal arc 1. Astronomy. Pertaining to, consisting of, or performed in, half the time between the rising and setting of a celestial body. Chiefly in semi-diurnal arc. ΘΚΠ the world > the universe > heavenly body > movement of heavenly bodies > [adjective] > movement in orbit > diurnal circle semi-diurnal1581 semi-nocturnal1594 1581 W. Borough Discours Variation Cumpas v. sig. C.j The quotient is the versed sine or shaft of the semidiurnall arke. 1594 T. Blundeville Exercises iii. i. xviii. f. 152 It deuideth the artificial day and artificiall night each of them into two parts, that is to say, into two semi-diurnal & into two seminocturnal partes. 1594 T. Blundeville Exercises iii. i. f. 174v There will remaine 9. houres 4′8. which is the length of the artificiall day, when the sunne is in the first degree of Scorpio, the one halfe whereof is called the semi-diurnall Arke of that artificiall day. 1694 J. Atkinson Wakely's Mariners-compass Rectified (new ed.) 93 Astronomical Tables Of Semidiurnal and Seminocturnal Arches. 1725 I. Watts Geogr. & Astron. xix The difference between the sun or star's semidiurnal arc and a quadrant or ninety degrees. 1852 J. R. Hind Astron. Vocab. 52 Semi-diurnal Arc, is half the arc described by a heavenly body between its rising and setting. 1867 G. F. Chambers Descr. Astron. 801. < as lemmas |
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