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Basins and Effects of Earth's Rotation: after C.A.M. King  |
 Amphidromic Points , Co-tidal Lines and Co-Range Circles in the North Sea |
where f=2 omega sin (phi) in which (omega=angular rotation) (phi= latitude)
v=velocity in y-direction; dP/dx = pressure slope in x-direction, or slope of water surface
thus, a slope in one direction causes a current at right angles to the slope, to the right in N.Hemisphere
a.k.a the Coriolis Effect, because of the rotation of the Earth