{"product_id":"a-manual-of-spherical-and-practical-astronomy-vol-2-embracing-the-general-problems-of-spherical-astronomy-the-special-applications-to-nautical-astronomy-and-the-theory-and-use-of-fixed-and-portable-astronomical-instruments-theory-and-use-of-ast","title":"A Manual of Spherical and Practical Astronomy, Vol. 2: Embracing the General Problems of Spherical Astronomy, the Special Applications to Nautical Astronomy, and the Theory and Use of Fixed and Portable Astronomical Instruments; Theory and Use of Ast","description":"Excerpt from A Manual of Spherical and Practical Astronomy, Vol. 2: Embracing the General Problems of Spherical Astronomy, the Special Applications to Nautical Astronomy, and the Theory and Use of Fixed and Portable Astronomical Instruments; Theory and Use of Astronomical Instruments; Method of Least Squares\u003cbr\u003e\u003cbr\u003eThe line of sight is he straight line drawn from the thread through the optical centre of the objective; for this line repro sents the direction of a,distant point (as a star), when the tele scope is so directed that an image of the point is formed at the thread. This line is also called the line of collimation; but we shall hereafter, for the sake of brevity, call it the sight-zine.\u003cbr\u003e\u003cbr\u003eAbout the Publisher\u003cbr\u003e\u003cbr\u003eForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com\u003cbr\u003e\u003cbr\u003eThis 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.","brand":"Forgotten Books","offers":[{"title":"Paperback","offer_id":39807586631725,"sku":"9781334031496","price":16.59,"currency_code":"GBP","in_stock":true}],"url":"https:\/\/www.thegreatbritishbookshop.co.uk\/products\/a-manual-of-spherical-and-practical-astronomy-vol-2-embracing-the-general-problems-of-spherical-astronomy-the-special-applications-to-nautical-astronomy-and-the-theory-and-use-of-fixed-and-portable-astronomical-instruments-theory-and-use-of-ast","provider":"The Great British Bookshop","version":"1.0","type":"link"}