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From the secular changes in the longitude of the node and the argument of the perigee, the coefficient J in the gravitational potential function was determined to be (1.6232±.0005)×10−3. If the bounding equigeopotential surface of the earth is assumed to be an ellipsoid of revolution, this value of J implies a flattening ƒ of 1/298.32±.05.
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Lecar et al. (1959) studied this question.
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