Excerpt from The Nautical Almanac and Astronomical Ephemeris for the Year 1835: With an Appendix The Semidiameters of the Planets, at the Mean Distance of the Earth from the Sun, have been assumed, as follow. 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.

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1835 edition. Excerpt: ...sidereal noon, add the mean interval corresponding to the given sidereal time; the sum will be the mean solar time required. (See Example at page 491.) In this mode of reduction there is not, as in the former, by means of the Tables of Acceleration and Retardation, any distinction of cases, all the quantities being additive. The Tables of Time. Equivalents differ from the Tables of Acceleration and Re terms of the other, instead of the corrections, respecting the proper application of which, a difficulty is sometimes felt by unpractised computers. Sidereal time at mean noon is also used in finding the mean time of transit of a heavenly body. Page III. of each Month. The Sun's Longitude, here given, is affected with aberration, and reckoned from the true equinox: it is therefore the apparent longitude of the Sun at the instant of mean noon; or it is (if p denote the Radius Vector) the true longitude of the Sun at the time 0h--495'-775 p, because aberration causes the Sun to appear behind its true place in the Ecliptic. The Sun's Latitude is the angular distance of the Sun's centre from the plane of the Ecliptic, measured on a circle perpendicular to that plane. The Logarithm of the Radius Vector of the Earth is the logarithm of the distance between the centre of the Earth and the apparent place of the centre of the Sun at mean noon, the mean distance, or the semi-axis major of the orbit, being considered unity. These quantities are derived immediately from the Solar tables, and enter into, indeed are the foundation of, nearly all the subsequent operations in the Ephemeris. Whenever the true longitude of the Earth is required, as in calculating the Geocentric position of a Planet or Comet from its Heliocentric position, it is necessary to...