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:

Feb 26, 2025Maha Shivaratri
Jan 29, 2026Milwaukee City Hall, Wisconsin, United States
An architectural wonder in Rajasthan
An island crossroad of culture
Dec 31, 2024New Years Eve in Rio de Janeiro, Brazil
Dec 30, 2024Mount Field National Park, Tasmania, Australia
Jan 1, 2025Happy New Year!
Dec 29, 2024Borobudur temple, Java, Indonesia
Nov 25, 2025Trevi Fountain, Rome, Italy
Jan 2, 2025Ardez village, Graubunden, Switzerland
Where is this historic hotel?
May 7, 2024A duckling swimming in a water meadow, Suffolk, England
Sep 1, 2025Great Basin National Park, Nevada, United States
Hangin around
Dec 17, 2023Bohemian waxwings
Jan 5, 2026A herd of impalas, Londolozi Game Reserve, South Africa
Mar 12, 2026Juvenile sunbittern displaying at nest, Ecuador
Jan 3, 2025Happy Birthday, J.R.R. Tolkien!
Dec 8, 2024Notre-Dame Cathedral, Paris, France
Jan 27, 2024Northern hawk owl
Sep 22, 2023World Rhinoceros Day
Jun 9, 2024Bardenas Reales Biosphere Reserve and Natural Park, Navarra, Spain
Oct 11, 2024Wood duck, Quebec, Canada
Regal Radiance
Nap your worries away
A castle full of history
Sep 10, 2024Vasco da Gama Bridge, Lisbon, Portugal
Mar 10, 2024Jim Corbett National Park, Uttarakhand, India
Jul 30, 2025Agra Fort, Agra, Uttar Pradesh
Aug 13, 2025Corona Arch near Moab, Utah, United States