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Definition informally:  either of the two days a year when the length of day and night are most equal


formally:  the exact moments when the earth's axis is parallel to the Sun
  • For a few minutes on the day of the equinox, the Sun's radiation overwhelms the receiving station for the geostationary satellite.
equinox = either of the two days a year when the length of day and night are most equal
  • According to Wikipedia, it is an urban legend that one can balance an egg on its point on an equinox day, but actually one can balance an egg on its point any day of the year with enough patience.
  • The spring equinox has just passed; they face six months of unrelenting night.
    Anthony Doerr  --  All the Light We Cannot See
  • Following the September equinox, the sun had emerged above the northerly horizon, rising in long spirals until December 21.
    Jules Verne  --  Twenty Thousand Leagues Under the Sea
  • Sometime around the equinox?
    Dan Brown  --  The Da Vinci Code
  • The Crucifixion and Resurrection come very near the spring equinox, the death of winter and beginning of renewed life.
    Thomas C. Foster  --  How to Read Literature Like a Professor
  • Ostara, the equinox, the balance of day to night?
    Nora Roberts  --  Dark Witch
  • The agency was still in shock over the Equinox Oil campaign.
    Don DeLillo  --  Underworld
  • At the equinox, the mothership will send a pod to extract Grace from the safe house ....
    Rick Yancey  --  The Infinite Sea
  • The vernal equinox now lay three months in the past, the summer solstice had arrived.
    Thomas Mann  --  The Magic Mountain
  • The season meanwhile was drawing onward to the equinox, and though it was still fine, the days were much shorter.
    Thomas Hardy  --  Tess of the d'Urbervilles
  • He will be executed tomorrow at the equinox.
    D.J. Machale  --  The Merchant of Death
  • I see Cornelia in the equinox, there in her highheeled shoes.
    Eudora Welty  --  The Collected Stories of Eudora Welty
  • The solstice[263] he does not observe; the equinox he knows as little; and the whole bright calendar of the year is without a dial in his mind.
    Ralph Waldo Emerson  --  Selected Essays
  • "The spring equinox," Bast explained.
    Rick Riordan  --  The Throne of Fire
  • Methinks now this coined sun wears a ruddy face; but see! aye, he enters the sign of storms, the equinox! and but six months before he wheeled out of a former equinox at Aries!
    Herman Melville  --  Moby Dick
  • The rainy season of the autumnal equinox being now come, I kept the 30th of September in the most solemn manner, as usual, it being the third year of my abode in the island.
    Daniel Defoe  --  Robinson Crusoe
  • I think if we had had the disposal of events—if Mansfield Park had had the government of the winds just for a week or two, about the equinox, there would have been a difference.
    Jane Austen  --  Mansfield Park
  • In reality, the only thing that could be isolated in the rocky paragraphs was the insistent hammering on the wordequinox, equinox, equinox, and the name of Alexander von Humboldt.
    Gabriel Garcia Marquez  --  One Hundred Years of Solitude
  • Every fourth year, at the vernal equinox, there is a representative council of the whole nation, which meets in a plain about twenty miles from our house, and continues about five or six days.
    Jonathan Swift  --  Gulliver's Travels

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