equinox

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Related to Equinoxes: precession of the equinoxes
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  • noun

Synonyms for equinox

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

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

References in periodicals archive ?
A question arose if there are a number of such "palindrome" centers existing at the equinoxes and "planetary equinoxes", separating the celestial body movement towards and away from the celestial equator.
Saturn experiences two equinoxes per orbit, just as Earth does, when the planet's equator lines up edge-on to its orbital plane, causing the sun to appear directly over the equator.
They knew when hours of light and dark would be even: 12 of each in spring and fall equinoxes.
At the equinoxes, in March and September, the Sun rises due east and sets due west.
Equinoxes are the only two times a year when the sun rises due east and sets due west.