The Nautical Almanac and Astronomical Ephemeris, for the Year 1781 (Classic Reprint)Excerpt from The Nautical Almanac and Astronomical Ephemeris, for the Year 1781 Of the epiiemeitis relating to the Sun were made from Mr. Maa's lafl manufcript Tables, received by the Board of Longitude after his Deccafe, which have been printed under my Infpeétion, and publilhed In 1770; but the Calculations of the Moon were made in this Emsusars, for the fifth time, from new Tables, improved from mayea's Tables, compofed Mr. Ciiar lbs mason, under my Direétion, m Calculations made by Order of the Board of Longitude, upon the Series of lunar Obfervations made by the late Dr. Bradley, and publilhed in the Nautical Almanac of 1774, Jn thele new Tables, the Epoch of the Moon's mean Longiuude is I lefs, that of the Apogee is 56_lefs, and that of the Afcending Node 45 more, than in maa's printed Tables, and the Equations are calculated to Tenths of a Second. Moreover, One new Equation is introduced, whofe Argument is the mean Diltance of the Moon from the Sun's Apogee, and Maximum Thefe new Tables, when compared with the above-mentioned Series of Oh fervations, a roper Allowance being made for the unavoidable rror Of Ob'fcrvation, feem to give always the Moon's Longitude in the Heavens correétly within Seconds Of a De cc; which greatefi: Error, added to a poflible rror of One Minute in taking the Moon's Dii'tance from the Sun or a Star at Sea, will at a Medium only pro, duce an Error of 50 Minutes of Longitude. 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. |
