The celestial equator: so called because, when the sun is on it, the nights and days are of equal length in all parts of the world.
| 单词 | θ54 |
| 释义 | the world > the universe > celestial sphere > circle of celestial sphere > [noun] > great circle > celestial equator (6) equinoctialc1386 The celestial equator: so called because, when the sun is on it, the nights and days are of equal length in all parts of the world. equatorc1400 Astronomy. A great circle of the celestial sphere, whose plane is perpendicular to the axis of the earth. (When the sun is in the equator, day and… weigherc1400 Used to translate Latin æquator (equator, n. 1). Cf. weigh, v.1 11c. Obsolete. middle line1595 The meridian (or its continuation below the horizon). Also: an equator, spec. the celestial equator or equinoctial. Obsolete. mid-circle1675 The great circle equidistant from the poles of a sphere; an equator. Obsolete. celestial equator1875 Of or pertaining to the sky or material heavens. celestial equator = equator, n. 1 (cf. equinoctial, adj. 1); celestial globe, celestial map: one… |
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