The Position of the Sun's Axis, as Determined from Photographs of the Sun, Taken in the Years 1874 to 1912, and Measured at the Royal Observatory, Gre

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Excerpt from The Position of the Sun's Axis, as Determined From Photographs of the Sun, Taken in the Years 1874 to 1912, and Measured at the Royal Observatory, Greenwich From 1874 to 1885, inclusive, the measures of positions and areas of Sunspots made at Greenwich were exhibited only in the form of a daily record of the Sun's surface. From 1886 onward, in addition to this daily record, the results of the measures were given in the form of a Ledger of Spot Groups, the various members of each group of spots being combined together for each day of Observation, as shown in the specimen annexed. These ledgers, therefore, give the total area of each group for each day during which it remained visible, its mean longitude from Carrington's zero meridian, its mean latitude, and also its longitude from the meridian passing through the centre of the apparent disc. In 1907 ledgers on the same plan were published for the twelve earlier years, 1874-1885. Thus these sunspot ledgers give, in a form convenient for various investigations, the histories of about 7000 separate spot groups which have appeared on the Sun's disc Since April 187 4, when the Greenwich record commenced. 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.