Assuming a spinning 2-sphere in the Euclidean 3-space that is observed by a frame at any exterior point, we deduce the Coriolis effect, which asserts
that the rotational directions of the flows on the Earth surface are
opposite across the Equator. By the continuity of the angular momentum, we
project the vector of angular momentum onto all tangent planes to the
sphere. We arrive at elliptical orbits and the spiral motions toward the
plug point of any domestic sink.
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References
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