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When is the equinox in the northern hemisphere?
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When does spring equinox occur?
In modern times [when?], since the Moon (and to a lesser extent the planets) causes Earth's orbit to vary slightly from a perfect ellipse, the equinox is officially defined by the Sun's more regular ecliptic longitude rather than by its declination.
- 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...
2 days ago · The vernal equinox, marking the beginning of spring in the Northern Hemisphere, occurs about March 21, when the Sun moves north across the celestial equator. The autumnal equinox falls about September 23, as the Sun crosses the celestial equator going south. What causes the seasons?
- The Editors of Encyclopaedia Britannica
Sep 4, 2024 · An equinox occurs when the Earth’s equator aligns with the Sun, making the Sun appear directly overhead at the equator. On the equinox, the Sun rises due east at the equator, and sets due west. This alignment results in nearly equal daylight and darkness across the globe.
Oct 19, 2023 · On Earth, there are two equinoxes every year: one around March 21 and another around September 22. Sometimes, the equinoxes are nicknamed the “ vernal equinox ” (spring equinox) and the “ autumnal equinox ” (fall equinox), although these have different dates in the Northern and Southern Hemispheres.
Mar 19, 2024 · When do the equinoxes happen? Equinoxes don't necessarily occur on the same day each year, rather they happen around or on March 20 and Sept. 23.
Sep 18, 2013 · The "equinox" happens twice every year around March 21 and September 21, but what does that really mean? Here are the real facts about the equinox.
