Introduction: The intention of the following treatise is to furnish the possessors of ordinary telescopes with plain directions for their use, and a list of objects for their advantageous employment. None but an eye-witness of the wonder and glory of the heavens can thoroughly understand how much they lose by description, or how inadequate an idea of them can be gathered in the usual mode, from books and lectures. It is but the narrative of the traveller instead of the direct impression of the scene. To do justice to this noble science, - to appreciate as we ought the magnificent testimony which it bears to the external Power and Godhead of him 'Who by his excellent wisdom made the heavens, ' we must study it, as much as may be, not with the eyes of others, but with our own......Many of the earliest books, particularly those dating back to the 1900's and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, mod