An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 111
ed,give us our first idea of the shape of the orbit, which appears ofan oval form, and at least resembles an ellipse; and, on further 86 THE SUN. trial, we find that it has the properties of an ellipse. Thus, let E(Fig. 32,) be the place of the earth, and a, h, c, &c. successive po-sitions of… … 163. These relative distances are found in two different ways;first, by changes in the sun^s apparent diameter, and, secondly, byvariations in his angular velocity. Were the variations in thesuns horizontal parallax considerable, as is the case with themoons, this might be made the measure of the…
Astronomy
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