Autumnal equinox 23 Sep 2023

Autumn has officially begun! In the Northern Hemisphere, the autumnal equinox falls on September 23 this year, marking the beginning of autumn and the Earth and Sun"s unique positions. Today is one of the two moments in the year when day and night are equal in length, thanks to the Sun"s location exactly above the Equator. The same celestial phenomenon applies to the Southern Hemisphere, but it is their vernal equinox as they head into spring.

© Stephen Matera/Tandem Stills + Motion

palette

Today in History

In a world of their own
23 Sep 2024Sea otter
23 Sep 2025Keel-billed toucan, Costa Rica
23 Sept 2026Autumn equinox

More Desktop Wallpapers:

7 Mar 2026The Brocken, Harz National Park, Germany
4 May 2024Brighton Festival
26 May 2024Methow Valley, North Cascades, Washington, USA
9 Aug 2026International Day of the Worlds Indigenous Peoples
When ice imitates art
Dare to delve into this dense swamp
9 Apr 2024Skagit Valley Tulip Festival
11 Sept 2026Villefranche-sur-Mer, Provence-Alpes-Côte dAzur, France
16 Jan 2025Pinnacles National Park, California, United States
24 Aug 2024Notting Hill Carnival
19 Aug 2025The Three Musketeers Falls at Iguazú Falls, Argentina
11 Sep 2025Gdańsk on the banks of the Motława river, Poland
How can we help at-risk animals?
6 Sep 2025Rufous hummingbird, Golden Gate Park, San Francisco, California, United States
15 Jan 2026The fishing village of Reine, Norway
2 Mar 2024Brit Awards
20 Jun 2025Maasai giraffe mother with calf in the Serengeti, Tanzania
8 Apr 2024Llansteffan Castle, Carmarthenshire, Wales
Sunset on Santorini
13 Jan 2025Happy Welsh New Year!
2 Feb 2025Alpine marmot
24 Apr 2024The white trilliums in Ontario, Canada
Rock House in Hocking Hills State Park, Ohio
8 Jan 2026Tufted titmouse, Massachusetts, United States
Aug 28, 2023Dubrovnik, Croatia
Wintry Swiss bliss
12 Oct 2024World Migratory Bird Day
1 Oct 2026Black History Month
7 Sep 2024Annas hummingbird
Dream world