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An equinox is a moment when the Sun crosses the Earth's equator, making day and night of approximately equal length. Learn about the two equinoxes on Earth, their dates, their cultural significance, and how they vary due to the Moon and planets.
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- The Equinoxes
- The Solstices
- Equinoxes and Solstices on Other Planets
There are only two moments each year when neither pole points toward the Sun, and the Sun lies directly above Earth’s equator. These moments are the equinoxes. The March equinox happens sometime between March 19 and 21. The September equinoxoccurs sometime between September 21 and 24. In the Northern Hemisphere, the March equinox is also known as t...
The farthest points from the equator where the Sun can appear directly overhead are referred to as the tropics. The tropics are lines of latitudethat circle the Earth above and below the equator, at about 23.4 degrees north and south. This angle is set by Earth’s axial tilt. There are two moments each year when one of Earth’s poles is tilted the mo...
Every planet in the solar system, apart from Mercury, is tilted on its axis of rotation. This means each planet has its own equinoxes and solstices. Venus and Jupiter have small axial tilts of 2.6* and 3.1 degrees, respectively. Venus orbits the Sun more quickly than Earth—in Earth time, an equinox or solstice happens on Venus every couple of month...
Equinox, either of the two moments in the year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and the celestial equator intersect.
- The Editors of Encyclopaedia Britannica
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Vernal equinox (about March 21): day and night of equal length, marking the start of spring. Summer solstice (June 20 or 21): longest day of the year, marking the start of summer. Autumnal equinox (about September 23): day and night of equal length, marking the start of autumn.
Mar 19, 2024 · This phenomenon is called an equinox, which comes from the Latin words "aequus" (equal) and "nox" (night). What causes an equinox? The Earth orbits the sun, at a tilt of about 23.5 degrees.
