A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 399
does not require that they should see both the beginning andend of the transit; observations of either place can be utilized : andthis is a great advantage. Suppose, then (Fig. 192), that the 386 DETERMINATION OP THE SUNS DISTANCE. observer W on one side of the earth notes the moment of… … Fig. 192.—DelisleB Method. from D ; i.e., simply twice the suns parallax. Now the angle D is atonce determined by the time occupied by Venus in passing from V\to V2, since in 581 days (the synodic period) she moves completelyround from the line DW to the same line again. If the time fromJ\ to V-2…
Astronomy
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