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The September equinox is the moment the Sun crosses the celestial equator —an imaginary line in the sky above Earth’s equator — from north to south. This happens on September 22, 23, or 24 in most years. 10 facts about the September equinox.
Here are 10 facts about the first day of astronomical fall (autumn) in the Northern Hemisphere. September is North's fall equinox. 1. Second Equinox of the Year. The September equinox is on or around September 22, while the first equinox of the year, the March Equinox, takes place on or around March 21 every year. 2.
Sep 21, 2021 · This happens Sept. 22, 2021, at 19:21 UTC, which is 2:21 p.m. CDT for us in North America. An illustration of the March (spring) and September (fall or autumn) equinoxes. During the equinoxes, both hemispheres receive equal amounts of daylight. Credit: NASA/JPL-Caltech.
The September equinox (or southward equinox) is the moment when the Sun appears to cross the celestial equator, heading southward. Because of differences between the calendar year and the tropical year, the September equinox may occur from September 21 to 24. At the equinox, the Sun as viewed from the equator rises due east and sets due west.
Jun 21, 2021 · Wednesday, September 22, is the first official day of fall. This also makes it the last day of summer, so start refreshing your sweater collection now. It's worth noting that this is the beginning of autumn in the Northern Hemisphere; in the Southern Hemisphere (where only 1 percent of the world's population lives) the equinox dates are reversed.
- Samantha Vincenty
- 2 min
- Senior Staff Writer
Feb 20, 2024 · The 2021 fall equinox will take place on Wednesday, September 22, 2021 at 3:21 p.m. Eastern. During that time, the Sun will be exactly above the Earth’s equator and will appear overhead at noon ...
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The March equinox happens sometime between March 19 and 21. The September equinox occurs sometime between September 21 and 24. 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 names are the other way around.
