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According to the astronomical definition, fall begins with the autumnal equinox. In the Northern Hemisphere, it's the September equinox; south of the equator, it is the equinox in March. What is an equinox? Equinoxes and solstices in your city. Autumn Equinox, Northern Hemisphere (September) North America, Europe, most of Asia, Northern Africa.
Aug 23, 2024 · autumnal equinox, 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
Sep 22, 2024 · In 2024, the autumnal (fall) equinox arrives on Sunday, September 22, marking the official first day of fall. Here's everything you should know about the fall equinox—plus our favorite fall facts, folklore, photos, and more!
The September equinox is when the Sun crosses the celestial equator southward, marking the end of astronomical summer and the beginning of autumn in the Northern Hemisphere. Learn about the dates, times, constellations, and cultural celebrations of this event.
Sep 18, 2017 · The 2024 fall equinox—also called the autumn equinox—takes place on Sunday, September 22, 2024. The fall equinox is not on the same day each year, though it always falls between September 21 ...
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. Equinox Local Time & Date
Sep 20, 2016 · Learn about the astronomical phenomenon of equinox, which marks the start of fall in the Northern Hemisphere and spring in the Southern Hemisphere. Discover how to observe Saturn, the moon, and star clusters in the night sky around the autumn equinox.
