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How long is a day on Saturn?
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Saturn
Saturn and its spectacular rings, in a natural-color composite of 126 images taken by the Cassini spacecraft on October 6, 2004. The view is directed toward Saturn's southern hemisphere, which is tipped toward the Sun. Shadows cast by the rings are visible against the bluish northern hemisphere, while the planet's shadow is projected on the rings to the left.
Determining the length of a day on Saturn was historically challenging because the planet lacks a solid surface, and its atmospheric cloud motions vary by latitude.
While early measurements based on magnetic field data from the Voyager era suggested a period of 10 hours 39 minutes 24 seconds, later observations from the Cassini mission indicated a longer duration. The rotation period of the planet's interior was eventually accurately measured by analyzing waves in Saturn's rings, which are influenced by the planet's gravitational field. This measurement established that a day on Saturn is 10 hours 33 minutes 38 seconds long.1