equinox

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English[edit]

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Alternative forms[edit]

Etymology[edit]

From Old French equinoce (French équinoxe), from Medieval Latin equinoxium, from Latin aequinoctium, from aequus (equal) + nox (night). Replaced Old English efnniht.

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Noun[edit]

equinox (plural equinoxes or equinoctes)

  1. The intersection of the ecliptic (apparent path of the sun) with the celestial equator.
    • 2005, Clive L. N. Ruggles, Ancient Astronomy: An Encyclopedia of Cosmologies and Myth
      Since it gets light before the sun rises and remains light after the sun sets, the actual period of darkness at the equinox will be substantially less than twelve hours, the exact amount depending on latitude and how one defines the boundary between twilight and night.

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