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 …

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 …

In 2025, the autumnal (fall) equinox arrives on Monday, September 22, marking the official first day of fall. Here's everything you should know about the fall equinox—plus our favorite fall …

Mar 14, 2025 · An equinox occurs twice every year, in March and September. In 2025, the equinoxes will occur on March 20, at exactly 09:01 UTC (or 2:01 AM PDT), and again on …

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 …

In 2025 the autumn equinox occurs on 22 September at 19.20 BST, marking the day when we experience roughly the same amount of daytime and nighttime. In this guide we'll explore the …

Sep 15, 2024 · The fall equinox is an important way to mark Earth's annual journey around the sun. The hours of darkness will gradually increase north of the equator until the solstice on …

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

The first day of fall 2025 arrives with the fall equinox on Monday, September 22, 2025, 2:19 p.m. What Is The Fall Equinox? In mid-September each year, we greet the fall season with the …

Mar 11, 2025 · 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 …