An Explanation of the Gnomonic Projection of the Sphere

An Explanation of the Gnomonic Projection of the Sphere
An Explanation of the Gnomonic Projection of the Sphere
Excerpt from An Explanation of the Gnomonic Projection of the Sphere: And of Such Points of Astronomy as Are Most Necessary in the Use of Astronomical Maps; Being a Description of the Construction and Use of the Larger and Smaller Maps of the Stars; As Also of the Six Maps of the EarthThis Treatise, though particularly intended for those who use either of the maps mentioned in the title-page, will, I hope, be found useful to all who wish to acquire a distinct idea of the connexion between projections in general, and the surface of the sphere which they represent. The leading principles derived from an accurate consideration of any one instance, are those which apply to every other hitherto used, with the exception only of what is called Mercator's Projection. But of all the methods in question, I should decidedly prefer the Gnomonic Projection for any purpose of general instruction, on account of its superior simplicity, and the ease with which the transition may be made from the sphere to its inclosing cube.Simple as a globe may be in its principle, there are many facilities afforded by a map; and on the other hand, there are some points in which the former has decided advantages over the latter. A map may be considered either as a catalogue for the practical astronomer, or as a picture of the heavens for a learner.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.Эта книга будет изготовлена в соответствии с Вашим заказом по технологии Print-on-Demand компанией ООО «Книга по Требованию». Print-on-Demand - это технология печати книг по Вашему заказу на цифровом типографском оборудовании. Книга, произведенная по технологии Print-on-Demand (POD) представляет собой классическую печатную книгу с соблюдением всех стандартов качества, от офсетной бумаги и плотного картона до качественного клея, используемого при изготовлении. Черно-белая текстовая или полноцветная иллюстрированная книга (в зависимости от исходного файла, подготовленного к печати) может быть изготовлена в разных вариантах: - в мягкой обложке (Клеевое Бесшвейное Скрепление); - скрепление скобой (для книг с небольшим количеством страниц); - в твердом переплете с клееным текстовым блоком; Материалы, используемые при производстве книги: - бумага текстового блока - офсетная (белая или кремовая) 80 г/м2 - мягкая обложка - бумага мелованная 250 г/м2; - ламинация обложки - матовая или глянцевая; - твердый переплет - картон 2 мм, каптал, белые форзацы, прямой корешок - сверхпрочный полимерный клей; - каждая книга упакована в термопленку. Каждый заказ обрабатывается в индивидуальном порядке: каждой книге, напечатанной по технологии Print-on-Demand, присваивается уникальный номер.