| 单词 |
evection |
| 释义 |
evection|ɪˈvɛkʃən|
[ad. L. ēvectiōn-em, n. of action f. ēvehĕre to carry out, f. ē- out + vehĕre to carry.]
†1. A lifting up; elevation, exaltation (in quot. fig.). Obs. rare—1.
1656in Blount Glossogr. 1659Pearson Creed (1839) 359 [Joseph's] evection to the power of Egypt next to Pharaoh.
2. Astron.
a. An inequality in the moon's longitude (see quot. 1787).
1706Phillips (ed. Kersey), Evection, or Libration of the Moon [The explanation confuses a and b.] 1787Bonnycastle Astron. 422 Evection, an inequality in the motion of the moon, by which, at her quarters, her mean place differs from her true one by about 2½ degrees more than at her conjunction and opposition. 1834Nat. Philos., Hist. Astron. ix. 45/1 (Usef. Knowl. Soc.), The evection discovered by Ptolemy is greatest in the quadratures. 1847Whewell Hist. Induct. Sc. I. 229 Such is the announcement of the celebrated discovery of the moon's second inequality afterwards called by Bulhialdus evection. 1879Newcomb & Holden Astron. 163 The disturbing action of the sun [upon the moon] produces a great number of other inequalities, of which the largest are the evection and the variation.
†b. Alleged to have been used for libration.
1706[see a]. 1796Hutton Math. Dict. I. 450 Evection is used by some astronomers for the Libration of the moon.
†3. evection of heat: the diffusion of heated particles through a fluid in the process of heating it; convection. Obs. |
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