NASA JPL(@NASAJPL):As of Sept. 22, it's officially fall in the Northern Hemisphere…while spring begins in the Southern Hemisphere. 🍁 🌎 💐 That's the September equinox, when the Sun is directly above Earth's equator and day and night are close to equal in length around the world.

NASA JPL

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The Jet Propulsion Laboratory advances science and discovery through NASA robotic missions exploring Earth, the solar system, and the universe.

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NASA JPL@NASAJPL

2026.09.22 15:29

As of Sept. 22, it's officially fall in the Northern Hemisphere…while spring begins in the Southern Hemisphere. 🍁 🌎 💐 That's the September equinox, when the Sun is directly above Earth's equator and day and night are close to equal in length around the world.

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