Astronomy. The time in which a celestial object, satellite, etc., performs one revolution about its primary (or about the centre of gravity of its…
| 单词 | θ575 |
| 释义 | the world > the universe > planet > primary planet > secondary planet, satellite > [noun] > time taken to perform orbit (3) period1646 Astronomy. The time in which a celestial object, satellite, etc., performs one revolution about its primary (or about the centre of gravity of its… periodic time1715 (a) Astronomy = period, n. 7b; (b) Science = period, n. 7e. time1764 The orbital period of a celestial object; = period, n. 7b. Now chiefly in periodic time n. (a) at periodic, adj.1 n.compounds. |
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