Equinox descends from aequus, the Latin word for "equal" or "even," and nox, the Latin word for "night"—a fitting history for a word that describes days of the year when the daytime and nighttime …

Northward equinox and southward equinox: names referring to the apparent direction of motion of the Sun. The northward equinox occurs in March when the Sun crosses the equator from south to north, …

In the Northern Hemisphere, the March equinox is also known as the spring or vernal equinox; the September equinox can be called the fall or autumnal equinox. In the Southern Hemisphere, the …

Mar 14, 2026 · The equinox marks the exact moment when the center of the Sun crosses the plane of our planet’s equator. The day of an equinox, observers at the equator will see the Sun directly …

Mar 19, 2026 · Equinox, either of the two moments in the year when the Sun is exactly above the Equator; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and …

Sep 4, 2024 · The equinox marks a significant astronomical event that occurs twice a year, signaling a moment of balance between day and night across the globe. It is when Earth’s tilt perfectly aligns …

Mar 31, 2026 · Equinox definition An equinox is a moment of time when the Earth’s axis is tilted neither toward nor away from the Sun, making day and night (almost) equal across the world.

EQUINOX definition: the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 vernal equinox, or …

/ ˈi·kwəˌnɑks, ˈek·wə- / Add to word list either of the two times during the year when the sun crosses the equator and day and night are of equal length, about March 21st and September 23rd (Definition of …

Oct 19, 2023 · As its name suggests, an equinox indicates equally illuminated hemispheres, with the solar terminator equally dividing Earth from north to south. (The solar terminator is the shadowed line …