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Birthday · September 22, 2025

Equinox at Saturn

September 22, 2025

Somewhere between the hydrogen and the starlight, between the gravity and the grace, the universe conspired to bring you into being.

Equinox at Saturn

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APOD published September 22, 2025. Credit: Imran Sultan. A publication-date match, not a photo taken on your date. Independent of NASA.

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Equinox at Saturn

Original APOD · September 22, 2025

On Saturn, the rings tell you the season. On Earth, today marks an equinox, the time when the Earth's equator tilts directly toward the Sun. Since Saturn's grand rings orbit along the planet's equator, these rings appear most prominent -- from the direction of the Sun -- when the spin axis of Saturn points toward the Sun. Conversely, when Saturn's spin axis points to the side, an equinox occurs, and the edge-on rings are hard to see from not only the Sun -- but Earth. In the featured montage, images of Saturn between the years of 2020 and 2025 have been superposed to show the giant planet passing, with this year's equinox, from summer in the north to summer in the south. Yesterday, Saturn was coincidently about as close as it gets to planet Earth, and so this month the ringed giant's orb is relatively bright and visible throughout the night.

Image credit: Imran Sultan

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