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. 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. In the Southern Hemisphere, today marks the vernal equinox and they are heading into spring.

© Stephen Matera/Tandem Stills + Motion

palette

Today in History

Sep 23, 2018Ahh-tumn
Sep 23, 2019Stepping into autumn
Sep 23, 2020A tree of many memories
Sep 23, 2021Last stop before leaving the solar system
Sep 23, 2022Golden jellyfish in Jellyfish Lake, Palau
Sep 23, 2024Sea Otter Awareness Week
Sep 23, 2025A keel-billed toucan in Costa Rica

More Desktop Wallpapers:

Dec 29, 2018When science looks like magic
Apr 28, 2022Fox kits
Mar 30, 2024Brown-throated three-toed sloth in cecropia tree, Costa Rica
Dec 31, 2025New Years Eve
Feb 1, 2025Black History Month
Nov 17, 2025National Take a Hike Day
Apr 6, 2022Crested caracaras
Jan 8, 2023Breckenridge, Colorado
May 10, 2023Cordouan Lighthouse, France
Mar 24, 2023Wild garlic in bloom at Hainich National Park, Germany
Mar 1, 2020Casting a vote for women s history
Jul 6, 2018Pandas pucker up for International Kissing Day
Nov 6, 2021World Numbat Day
Dec 31, 2024New Years Eve in Rio de Janeiro, Brazil
Nov 11, 2023Veterans Day
May 18, 2019A ‘city’ within Valencia
Jun 30, 2021An impactful day
Jul 26, 2024Summer Olympics begin in Paris
Dec 7, 2019Remembering the Arizona
Sep 26, 2018Art in the chapel
Dec 4, 2025International Cheetah Day
Jun 1, 2020The largest living organism on Earth
Jun 9, 2025Old City of Dubrovnik in Dalmatia, Croatia
Apr 22, 2026Earth Day
Dec 7, 2024National Pearl Harbor Remembrance Day
May 31, 2024Gunnerside, Yorkshire Dales National Park, England
Oct 16, 2019Paleontology meets art
Apr 20, 2022Mute swans
Jan 7, 2024Old Rock Day
Oct 27, 2022Bridge of Sighs in Venice, Italy