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Excerpt from Treatise Astronomy Theoretical and Practical, Vol. 1 It may be necessary briefly to state the arrangement of the present Treatise. In the first Chapters, I have explained, in a general way, certain of the obvious Phenomena of the Heavens : then, with a view of affording the Student the means of distinctly apprehending the methods, by which, those Phenomena are observed, and their quantities and laws ascertained, I have described, although not minutely, some of the principal instruments of an Observatory. By an attentive consideration of the means, by which, in practice, right ascensions and latitudes are estimated and computed, a more precise notion of those quantities may, perhaps, be obtained, than either from the terms of a definition, or from their representation in a geometrical diagram. But, an observation expressed by the graduations of a quadrant, or the seconds of a sidereal clock, cannot be immediately used for Astronomical purposes. 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.