Autumnal equinox - Wikipedia
Autumnal equinox or variations, may refer to: September equinox, the autumnal equinox in the Northern Hemisphere. March equinox, the autumnal equinox in the Southern Hemisphere.
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.
September equinox - Wikipedia
The equinox may be taken to mark the end of astronomical summer and the beginning of astronomical autumn (autumnal equinox) in the Northern Hemisphere, while marking the end of astronomical winter and the start of astronomical spring …
Autumnal equinox | Definition, Dates, & Facts | Britannica
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.
10 Facts About the September Equinox - timeanddate.com
By Aparna Kher. On September 22, 2024, the day and night are almost equal in most locations. Here are 10 facts about the first day of astronomical fall (autumn) in the Northern Hemisphere. September is North's fall equinox. ©iStockphoto.com/Givaga. 1. Second Equinox of the Year.
2025 September equinox: All you need to know - EarthSky
The 2025 September equinox will fall at 18:20 UTC (1:20 p.m. CDT) on September 22, 2024. On this day, days and nights are approximately ( but not exactly ) equal in length for everyone across...
Autumn equinox is the first day of fall. How is that different from …
Sep 22, 2022 · The first day of fall marks the autumn equinox, which is different from a solstice. Today is the fall equinox and first day of autumn, when the sun rises directly in the east and sets directly...
Autumnal Equinox and Other Sky Events: What You Need to Know
Sep 20, 2016 · Autumnal Equinox and Other Sky Events: What You Need to Know. Find out what an equinox is and how the day is linked to the reason for the seasons. As the 2017 Equinox approaches, look back...
Autumn Equinox: The Science Behind the First Day of Fall
Sep 23, 2019 · In the Northern Hemisphere, we call this the fall or autumn equinox, and it marks the first day of fall. Around the world, people celebrate the day with ceremonies, some of them ancient, and...
Autumn - Wikipedia
Some cultures regard the autumnal equinox as "mid-autumn", while others with a longer temperature lag treat the equinox as the start of autumn. [2] In the English-speaking world of high latitude countries, autumn traditionally began with Lammas Day and ended around Hallowe'en , the approximate mid-points between midsummer , the autumnal equinox ...