Originally published in 1900, this book presents a collection of fascinating lectures collated from the manuscripts of Professor John Couch Adams. The lectures, which were taught at the University of Cambridge between the years 1860–89, aimed 'to illustrate geometrically the analytical processes' of the Lunar Theory and 'render them more comprehensible'. The book contains a total of eighteen lectures, ranging from accelerations of the Moon relative to the Earth to the parallactic inequality, all presenting the principal theorems from the turn of the century as well as in turn highlighting the tangible array of challenges still faced by physicists in the field. This book will serve as a useful reference tool for researchers and students investigating the history of the Lunar Theory and will be of considerable value to anyone interested in physics, cosmology and astronomy.