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Physical geodesy, the study of the gravitational field of the earth, has seen a tremendous progress in the last 20 years. Much of this progress is due to the author. He is professor at the Technical University at Graz, Austria, and adjoint professor at The Ohio State University. Presently, he is president of the International Association of Geodesy. The progress has taken place both in the theoretical foundation and in the practical field; however, the book under review deals nearly exclusively with the advances in theory. The author has furthermore restricted himself to the treatment of time invariant phenomena.
C. C. Tscherning (1982) studied this question.