(geography, often “the Equator”) An imaginary great circle around the Earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere.
天文學A similar great circle on any sphere, especially on a celestial body, or on other reasonably symmetrical three-dimensional body.
A short form of the celestial equator.
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From Late Latin (circulus) aequator (diei et noctis).
- 維基詞典 :equator (CC BY-SA 3.0)