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Under the hypothesis of hydrostatic equilibrium the
 planets of the solar system are represented on the plane (J"2, w2 a?/MG)
 (J2 = second term of the gravitational potential, w = rotation rate of the
 planet, a — equatorial radius, M — mass of the planet, G = gravitational
 constant). Since the points representing the planets lie on a straight line
 it is possible to obtain informations on the giration moment and the moment
 of inertia of Uranus and Pluto.