Finally available, a high quality book of the original classic edition of Letters on Astronomy - in which the Elements of the Science are Familiarly - Explained in Connection with Biographical Sketches of the - Most Eminent Astronomers. It was previously published by other bona fide publishers, and is now, after many years, back in print.
This is a new and freshly published edition of this culturally important work by Denison Olmsted, which is now, at last, again available to you.
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A circle cut around the apple, half way between the poles, will be the equator; and several other circles cut between the equator and the poles, parallel to the equator, will represent parallels of latitude; of which, two, drawn twenty-three and a half degrees from the equator, will be the tropics, and two others, at the same distance from the poles, will be the polar circles. ...When you have thus made a sphere for yourself, or, with an artificial globe before you, if you have access to one, proceed to point out on it the various arcs of azimuth and altitude, right ascension and declination, terrestrial and celestial latitude and longitude,—these last being referred to the equator on the earth, and to the ecliptic in the heavens. ...If, as I trust, you have gained a clear and familiar knowledge of the circles and divisions of the sphere, and of the mode of estimating the position of a heavenly body by its azimuth and altitude, or by its right ascension and declination, or by its longitude and latitude, you will now enter with advantage upon an account of those instruments, by means of which our knowledge of astronomy has been greatly promoted and perfected.
About Denison Olmsted, the Author:
Olmsted possessed considerable mechanical talent, which he used in promoting and perfecting the inventions of others, but while he himself frequently invented articles of convenience and comfort, such as the Olmsted stove, he seldom secured his rights by patents. ...It was followed by various text-books on natural philosophy and astronomy, but he is chiefly known to the scientific world for his observations on hail (1830), meteors and the aurora borealis (see Smithsonian Contributions, vol. viii, Washington, 1850).