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Saturn Day

The "day" on Saturn is between 10 and 11 Earth hours long (from 10 hours 14 minutes to 10 hours 39 minutes, with the average 10 hours 32 minutes). Saturn's rotational speed is based on the atmosphere and varies by latitude, being fastest at the equator. Remember that Saturn is one of the gas giants, and it has what is called differential rotation. A solid object turns uniformly, but a gaseous (fluid) ball like one of the gas giants or the sun have different parts of themselves moving at different speeds.

Saturn Year

A year on Saturn is 29.45 years (just over 10,759 Earth days). Its orbit is much longer, and its orbital speed of 9.69 km/s is slower than that of planets closer to the Sun. Based on the average day length, the Saturnian year takes about 24,491 Saturnian days.

Details

Saturn's day is problematic because different parts rotate faster than others. The equator (from the northern edge of the South Equatorial Belt to the southern edge of the North Equatorial Belt) rotates once every 10 h 14 min, while the rest rotates once every 10 h 39 min.

The latest calculations show that Saturn's rotation may be slowing, as this calculation is 15 minutes slower than it was last year. However, since Saturn is a gas giant planet, it's difficult in the past to estimate the rotational period. For planets like Earth, rotation is measured by noting a fixed point on a landmass, but with gas planets it must be measured by observing the rotation period of the magnetic field. However, this only works best when the rotation of the magnetic field is different than the interior solid core of the planet. In Saturn's case, both the rotational period of the core and the magnetic field are almost identical, making it much more difficult to measure.

Current calculations of Saturn's rotation are from the orbiting Cassini spacecraft. 15 hours

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10y ago

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