Proctor, Richard A. (Richard Anthony), 1837-1888 · New York, A.C. Armstrong and son · leaf 297
h really a very minute quantity, and;a very slight mistake in observation would cause a veryj2;reat mistake in the measurement of the suns distance.Acordingly, Halley devised a plan by which one ob-.•ser\er in the north (or as at A, ^xg. 47) would watch TRANSITS OF VENUS. 285 Venus as she traversed… … Fg. 49. these paths v\^ere, and therefore how placed on the sunsface, as in fig. 49 ; that is, how far apart, which is thesame thing as determining/^ a, ^^g. 48. This was Halleysplan, and as it requires that the duration of the transit 2S6 TRANSITS OF VENUS. should be timed, it is called the method…
Astronomy
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