An equinox in astronomy is the point in time when the Sun is directly above the Earth's equator, occurring around March 20 and September 23 each year.
In most cultures, the equinoxes and solstices are considered to start or separate the seasons.
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Small, blocky shapes of towns, fields, and pastures surround the graceful swirls and whorls of the Mississippi River, the largest river system in North America.
© Photo : NASA's Goddard Space Flight Center/USGS
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The scary face in this image is actually inundated patches of shallow Lake Eyre (pronounced "air") in the desert country of northern South Australia.
© Photo : NASA's Goddard Space Flight Center/USGS
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Salt Ponds, coastal flats, Western Australia.
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Downhill track at the Sheregesh ski resort in the Kemerovo region.
© Sputnik / Alexandr Kryazhev
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Aerial view taken on December 15, 2008 on the French Indian Ocean island of La Reunion, shows lava flowing out of Le Dolomieu crater of The Piton de la Fournaise volcano, one of the world's most active volcanoes.
© AFP 2023 / Richard Bouhet
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The Operational Land Imager (OLI) on NASA's Landsat 8 satellite acquired this large natural-color image showing a view of the Caspian Sea around the Tyuleniy Archipelago on April 16, 2016.
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Walrus rookery on the coast of one of the Franz Joseph Land archipelago islands.
© Sputnik / Ilya Timin
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Natural fire in the Amursk region.
© Sputnik / Igor Ageyenko
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Aerial view from a plane outside Madrid.
© Sputnik / Alexander Vilf
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Oroktoy Bridge across the Katun river in the Altai region.
© Sputnik / Alexandr Kryazhev
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Aerial view of the Rose Lake with fishing boats lined up on the shore, taken during the 15th and final stage of the Dakar Rally, 21 January 2007.
© AFP 2023 / Damien Meyer
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Mackenzie River in Canada's Northwest Territories.