| 单词 | tropical month |
| 释义 | > as lemmastropical month tropical month n. [compare ancient Greek οἱ τροπικοὶ μῆνες, plural] †(a) a month in which the moon is close to a solstitial point, or closer to a solstitial point than to an equinoctial point (obsolete); (b) the interval between two successive passages of the moon through the same solstitial or equinoctial point. ΚΠ 1686 J. Goad Astro-meteorologica iii. ii. 391 December is a Tropical Month, as March is an Equinoctial. 1752 J. Jackson Chronol. Antiq. II. 45 At the Summer Tropic, when the Attic Year commenced, the Athenians celebrated a public Festival, and offered sumptuous Sacrifices to the Sun; from which the tropical Month was called Hecatombæon. 1869 Philos. Trans. 1868 (Royal Soc.) 158 687 Twice in the course of a tropical month, when the moon is on the equator, her diurnal effect vanishes. 1988 H. A. Klein Sci. Measurem. xv. 153 A tropical month, with 29.530 40 mean solar days, is just 0.000 19 such days, or about 16.4 second, shorter than a synodic month. < as lemmas |
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