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GlossaryEquinox

Definition

Equinox

An instant when the Sun crosses the celestial equator. Day and night are nearly equal. This site lists the March and September equinoxes for 2026 in UTC.

An equinox is an astronomical instant. It is not the same thing as a spiritual new year, and not every tradition marks it.

Where this word is used

  • The Seasons explains. The seasons page lists the equinox instants this definition refers to.

See it on the constellation