Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 346
uringit. Before that time it was necessary to rely entirely uponobservations of either Mars or Venus, made at times whenthey come specially near us. Most of the methods of getting the suns parallax and dis-tance from such observations depend upon our having a pre-vious knowledge of the relative… … Fig. 99. — Transit of Venus. they are found (the explanation involves a little Trigonom-etry), we limit ourselves to giving here a single very simplemethod, which requires a previous knowledge not of the rela-tive distances of Venus and the earth from the sun, but onlyof the synodic period of the…
Astronomy
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