Excerpt from Monthly Notices of the Royal Astronomical Society, Vol. 27: Containing Papers, Abstracts of Papers, and Reports of the Proceedings of the Society, From November 1866, to June 1867; Being the Annual Half-Volume of the Memoirs and Proceedings of the Royal Astronomical Society Since the time spoken of in the Report from which I have quoted, ' two excellent determinations of Jupiter's mass from the motions of his satellites have been made, the first by Airy, the second by Bessel. The observations used by the former were made partly at Cambridge, and partly at Greenwich. The author remarks in the first of his three papers on the subject (memoirs of the R. A. S., vol. Vi., p. That, consi dering the great importance of the mass of Jupiter in both planetary and cometary investigations, it seems remarkable that no attempts should lately have been made to ascertain the correct value from the readiest of all means, the elongations of his satellites. It is true that the value adopted by Laplace. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.