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Excerpt from Astronomical Papers Prepared for the Use of the American Ephemeris and Nautical Almanac, Vol. 5: Part III, Action of the Planets on the Moon The changes indicated by this formula were made in the mean longitude Of han sen's lunar tables, and the Observations up to the year 1863 show that the corrected motion agrees remarkably well with the fact. The simple way in which this agree ment was brought about would seem to point very strongly to the theoretical correct ness Of the proposed change. Yet the most rigid examination into the subject has failed to Show the possibility Of any error in hansen's result. Meanwhile an independent test Of the constancy Of the Earth's axis Of rotation has been made through the discussion Of the Observed transits of Mercury, published in the first volume Of the present series. The results of this test were inconclusive, in that, while it seemed proved very clearly that the apparent inequalities in the motion of the Moon were not wholly due to changes in the Earth's rotation, yet such changes were indicated in a somewhat inconclusive way, having a certain general analogy to those previously inferred from the motion of the Moon, though much smaller in amount, and therefore not very certain. What is most remarkable in this connection is that a study Of the motions Of the Moon, Mercury, and the first satellite Of Jupiter all agree in indicating that, during some years previous to 1863, there was an increase in the speed Of the rotation Of the Earth which, however, rapidly subsided about that epoch. Added importance was thus given to the theoretical side Of the question. 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.

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