Popular astronomy : a concise elementary treatise on the sun, planets, satellites and comets (1865)
Mitchel, O. M. (Ormsby MacKnight), 1809-1862 · New York : Oakley & Mason · leaf 34
nd measure its length. From B draw the visualray B C, and measure the angle C B A. We havethus formed a right-angled triangle, in which the angleat C is a right angle, the base, C B, is known by mea-surement, and* the angle C B A is known in the sameway, hence may be computed, by the simplest… … portion to the number of times C B must be taken tomeasure C A. In our attempt to measure the suns dis-tance we are limited to a base line equal in length to theearths diameter, and hence it becomes necessary to em-ploy every refinement of art to eliminate as far as pos-sible the errors involved in…
Astronomy
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