Smith, Hamilton Lanphere, 1819-1903. [from old catalog] · Cleveland, M. C. Younglove and company · leaf 43
bject, due to a real change ofplace in the observer, is called parallax, and by its means, we candetermine the distances of the heavenly bodies. Thus, supposingspectators on opposite portions of the earths surface, as at A andB, to view the moon or a planet, at c, the observer at A, will seethe… … the spectator. This change, enables us to ascertain the dis-tance of the object with much precision, for supposing A andB joined by a line, we have a triangle ABC, in which one side AB, is known, and all three angles — for the observers at A and Bdetermine with some graduated instruments, the…
Astronomy · Meteorology · Geology · Paleontology
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