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Từ điển WordNet v3.1 - WordNet Dictionary
equinox


noun
1. either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
Derivationally related forms:
equinoctial
Hypernyms:
cosmic time
Hyponyms:
vernal equinox, March equinox, spring equinox, autumnal equinox, September equinox, fall equinox
2. (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
Syn:
equinoctial point
Topics:
astronomy, uranology
Hypernyms:
celestial point
Hyponyms:
vernal equinox, autumnal equinox

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