The gas planets (Jupiter, Saturn, Uranus, and Neptune) have no surface to speak of, so how was it determined how long a day is?
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The gas rotates. You measure that rotation.
On earth, it’s not as if only the solid, rocky surface rotates but not the atmosphere, or we’d have 1000mph winds! The atmosphere rotates in unison with the ground.
A planet entirely made of gas would rotate the same way.
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