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The Coriolis frequency ƒ, also called the Coriolis parameter or Coriolis coefficient, is equal to twice the rotation rate Ω of the Earth multiplied by the sine of the latitude φ {\displaystyle \varphi }.
The rotation rate of the Earth can be calculated as 2π / T radians per second, where T is the rotation period of the Earth which is one sidereal day. In the midlatitudes, the typical value for f {\displaystyle f} is about 10 rad/s. Inertial oscillations on the surface of the earth have this frequency. These oscillations are the result of the Coriolis effect.
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