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Definitions of equinox:

noun: 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
noun: (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic

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Alternative Terms
ecliptic vernal-equinox autumnal-equinox astronomical-coordinate-system calendar precession meteorological-optics equator celestial-sphere solstice zodiac astrology mundane aleister-crowley biannual horoscope sun earth coordinated-universal-time celestial-coordinate-system equinox-celestial-coordinates astronomy-dragonland-album march-20 september-23 celestial-equator day radius minute-of-arc spring autumn northern-hemisphere southern-hemisphere hebrew-calendar mars aries-astrology libra-astrology constellation pisces-constellation virgo-constellation chunfen qiufen solar-term pinyin romanization-of-japanese chinese-language japanese-language korean-language vietnamese-language gregorian-calendar april-4 april-5 october-8 season obliquity september-22 june-21 december-21 terminator-solar longyearbyen svalbard norway singapore march-21 june-22 december-22 greenwich tonga september-24 1999 march9 time-zone equation-of-time atmospheric-refraction diurnal-motion twilight-comics culmination-2 right-ascension sidereal-time hour-angle western-astrology jyoti-a computus easter march-22 iranian-calendar bah-calendar persian-people iran nowruz history-of-the-name-azerbaijan afghanistan la-india turkey zanzibar albania central-asia kurds zoroastrianism bah-faith mehr

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