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- Autumnal equinox | Definition, Dates, Facts | Britannica
The autumnal equinox refers to the two moments in the year when the Sun appears in the sky 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
- Equinox - Wikipedia
In the Northern Hemisphere, the March equinox is called the vernal or spring equinox while the September equinox is called the autumnal or fall equinox In the Southern Hemisphere, the reverse is true During the year, equinoxes alternate with solstices Leap years and other factors cause the dates of both events to vary slightly [12]
- When is the First Day of Fall? Autumnal Equinox 2025
The autumnal equinox is an astronomical event that marks the start of autumn (or fall) In the Northern Hemisphere, the autumnal equinox occurs in September; in the Southern Hemisphere, it occurs in March
- When is the autumnal equinox? Is it fall? When do clocks fall back? See . . .
The autumnal equinox occurs on Monday, September 22, at 2:19 P M ET in the Northern Hemisphere Daylight saving time will end on Sunday, November 2, 2025, when clocks will "fall back" one hour
- What Is Fall Equinox? - HISTORY
The fall equinox marks the first day of fall in the Northern Hemisphere (The reverse is true in the Southern Hemisphere, where the September equinox signals the first day of spring )
- What is the fall equinox? Astronomical season begins Sept. 22 this year . . .
Fall begins in the Northern Hemisphere on Monday, Sept 22, when Earth experiences equal day and night, known as the autumnal equinox
- Sept. 22 is the autumnal equinox: What to know - ABC News
In the fall, the autumnal equinox occurs when the center of the sun passes Earth's equator, and on the day of the equinox, the sun will be directly overhead at noon, according to NASA
- When is the fall equinox, and why does it happen? - Live Science
This year, the autumn equinox occurs on Monday, Sept 22 at 2:19 p m EDT (18:19 UTC), according to Time and Date, and it brings roughly equal day and equal night to the entire planet
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