| 单词 | periodical month |
| 释义 | > as lemmasperiodical month periodical month n. Astronomy (now rare) a synodic month. ΘΚΠ the world > time > period > a month or calendar month > [noun] > lunar month monthOE lunation1398 moon1487 month of consecution in Astr1561 lunar month1594 lunary month1602 periodical month1603 month of progression1615 synodic month1669 1603 C. Heydon Def. Iudiciall Astrol. 428 If he account as Galen doeth, the Periodicall moneth to containe 27. daies and 8. houres. 1765 Philos. Trans. 1764 (Royal Soc.) 54 30 The time of a periodical month gave him the ratio of the versed sine of the arc of the Moon's orbit which she describes in one second, to the radius. 1846 J. Joyce Astron. in Sci. Dialogues xiv. 98 This is called the periodical month. 1954 Isis 45 352 Such evidences of instability as the apparent shortening of the moon's periodical month were used to refute the doctrine of the eternity of the world. < as lemmas |
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