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I recently read about the high wind speeds on Saturn and the other gas-giant planets. What is wind speed on a gas giant measured relative to?

ORION CARRIER, VICTORIA, BRITISH COLUMBIA
The deep rotation of the gas giants serves as the yardstick for determining how fast their winds blow. At the equator, Saturn rotates in 10 hours, 14 minutes. Planetary scientists determine this rotation period by looking at radio waves (mostly in the decimeter wavelength range) generated deep within Saturn's interior. As the planet rotates, the radio waves oscillate in a periodic fashion, and the pattern can be analyzed to determine how fast the planet's equator rotates. Saturn's giant magnetos...

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