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:

Sep 20, 2023Aqueduct, Arkadia Park, Poland
Nov 13, 2024Sea lion in a kelp forest, Baja California, Mexico
May 14, 2024Carlsbad Caverns National Park in New Mexico
Dec 29, 2020Where the glow of the holidays lingers
Jun 2, 2021The dry days of winter in Etosha
Oct 5, 2020Hey, you two in the front!
Aug 22, 2018Summer’s in home stretch
May 20, 2022World Bee Day
May 31, 2022World Parrot Day
Sep 18, 2018A red knot on the Shetland Islands, Scotland
Dec 4, 2025International Cheetah Day
Jan 19, 2018Old Town in Prague, Czech Republic
Dec 22, 2024Christmas tree at Crystal Pier, San Diego, California
Jun 1, 2018In Apia Harbor for Samoan Independence Day
Jun 4, 2019Breaking the fast for Eid
Dec 3, 2018Computer science on the page
Apr 10, 2022Siblings Day
Jun 11, 2024Southern gemsbok in the savannah, Botswana
Jul 4, 2022Independence Day
Nov 6, 2024Shi Shi Beach, Olympic National Park, Washington
Mar 10, 2025National Napping Day
Aug 30, 2020Hay, what s up?
Apr 2, 2018Seven Magic Mountains art installation, Jean Dry Lake, Nevada
Oct 9, 2023Indigenous Peoples Day
Dec 27, 2018A wonderland in winter
Feb 14, 2019Cue up the tango music
Mar 4, 2021The most wonderful day of the year. Period.
Jan 9, 2019What, no escalator?
Dec 12, 2023Poinsettia Day
Jul 5, 2022Fannette Island, Lake Tahoe