September 19, 2021
The atoms in your body have known many forms: star core, drifting dust, ocean mineral, living cell.
Rings and Seasons of Saturn
Birthday · September 19, 2021
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APOD published September 19, 2021. Credit: Damian Peach. A publication-date match, not a photo taken on your date. Independent of NASA.
On Saturn, the rings tell you the season. On Earth, Wednesday 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 2004 and 2015 have been superposed to show the giant planet passing from southern summer toward northern summer. Saturn was as close as it can get to planet Earth last month, and this month the ringed giant is still bright and visible throughout much of the night
Image credit: Damian Peach