This book, in three parts, describes three phases in the
development of the modern theory and calculation of the Moon's
motion. Part I explains the crisis in lunar theory in the 1870s
that led G.W. Hill to lay a new foundation for an analytic
solution, a preliminary orbit he called the "variational curve."
Part II is devoted to E.W. Brown's completion of the new theory as
a series of successive perturbations of Hill's variational curve.
Part III describes the revolutionary developments in
time-measurement and the determination of Earth-Moon and
Earth-planet distances that led to the replacement of the Hill
Brown theory in 1984.
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