Autumnal equinox Sep 23, 2023

Autumnal equinox

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

Jellies in a world all their own
Sep 23, 2024Sea otter in Prince William Sound, Alaska, USA
Sep 23, 2025Keel-billed toucan, Costa Rica

More Desktop Wallpapers:

This snow will never melt
Apr 20, 2024Yellowstone National Park, Wyoming, USA
May 12, 2024Mothers Day
‘Spotting’ deer in the wild
The Riviera of India
Hiding in the woods
Protecting the gentle giants
May 29, 2024World Otter Day
The Big Apple with a foggy topping
Oct 3, 2025Glen Brittle, Isle of Skye, Scotland
The festival of breaking the fast
Rebels of the owl world
A labyrinth of luxury
Creating a better world
Let there be lights!
The Royal touch
Paint the sky with colours
Jun 17, 2024Green-crowned brilliant hummingbird
Feb 21, 2025Champaka Sarasi, Shivamogga, Karnataka, India
Fragrant fields as far as the eye can see
Dec 31, 2025New Years Eve
Apr 21, 2024Great Smoky Mountains National Park, Tennessee, USA
A mirror reflecting natures beauty
Jul 24, 2025Adalaj Stepwell, Ahmedabad, Gujarat
Dare to delve into this dense swamp
May 12, 2025An iris garden in Tokyo, Japan
Dec 9, 2025Guanaco, Punta Norte, Valdés Peninsula, Argentina
A bevy of buzzers
Apr 29, 2024Fujian Tulou, China
Apr 24, 2026Everglades National Park, Florida, United States