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Coriolis force

The coriolis force is, besides the centrifugal force, the second fictitious force, which only occurs in rotating systems. Due to the rotation of the earth in the Northern Hemisphere moving objects (also the air) are deflected to the right of its path, in the Southern Hemisphere to the left. The coriolis force only influences large scale phenomenons like low pressure systems. It has no influence to the direction of the eddies in a wash basin.