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A treatise on astronomy, descriptive, physical and practical. Designed for schools, colleges, and private students (1849)

Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Albany, N.Y., E.H. Pease & Co.; [etc., etc.] · leaf 141

An illustration from A treatise on astronomy, descriptive, physical and practical. Designed for schools, colleges, and private students, 1849, leaf 141 — , the center of Venus, its absolute breadth will depend onits distance from the point v; that is, the two triangles ABvand a b v ( Fig. 27) will be proportional, and we have A v : a v :: A B : a b. The result But the first three of these terms are known; therefore thefourth, a b, is known also; and… … on the sun becomes known, the whole sem-idiameter becomes known, and from thencethe horizontal parallax is immediately dedu-ced.* (123.) The accuracy of this method should bequestioned when Venus passes near the sunscenter, for the two chords are never more than30 asunder, and hence they will not…

Astronomy

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