Reports

Theory of Rotation for the Planet Mercury

Science  24 Dec 1965:
Vol. 150, Issue 3704, pp. 1717
DOI: 10.1126/science.150.3704.1717

Abstract

The theory of the rotation of the planet Mercury is developed in terms of the motion of a rigid system in an inverse-square field. It is possible for Mercury to rotate with a period exactly two-thirds of the period of revolution; there is a libration with a period of 25 years.