An important physical concept appropriate to a rotating globe such as a planet, angular momentum is defined as the moment of the linear momentum of a particle about a point, thus:
where M is the angular momentum about a point 0, 
the position vector from 0 to the particle, m the mass of the particle and 
the velocity.
Angular momentum plays an important role in both the Earth’s rotation and the coupling of the solid earth to the atmosphere. The speed of rotation (angular velocity) of the Earth varies only by small amounts, and these may be related in part to angular momentum lost to or received from the atmosphere. The atmospheric circulation patterns are modified by these energy transfers. The Earth’s angular velocity is the speed of its rotation about the geographic pole, thus its pole of instantaneous rotation, and not with reference to a point in space. The angular velocity is approximately 2π/S or sidereal day of 86 164.09 seconds, roughly 24 hours, or 15.04106863 seconds of arc per...
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Atmospheric Circulation, Global
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Fairbridge, R.W. (2005). Angular Momentum, Angular Velocity. In: Oliver, J.E. (eds) Encyclopedia of World Climatology. Encyclopedia of Earth Sciences Series. Springer, Dordrecht . https://doi.org/10.1007/1-4020-3266-8_10
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