Introduction       Discovering existence of inertial and noninertial reference frames we have learned that Newton second law describing planar motion in an inertial (x,y) reference frame m Dvx / Dt  =  Fx           (0a),       m Dvy  / Dt  =  Fy             (0b) when transformed to a uniformly rotating (x',y') reference frame, takes a new form that includes Coriolis and centrifugal pseudoforces m Dv'x / Dt  =  F'x  + 2mwv'y + mw2x'       (1a) m Dv'y / Dt  =  F'y  -  2mwv'x + mw2y'       (1b). These pseudoforces are formally describing effects of body's inertia as seen from a rotating reference frame. With their help we have explained a phenomenon of stationary satellites.

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