Proctor, Richard A. (Richard Anthony), 1837-1888 · New York, A.C. Armstrong and son · leaf 301
ide for othermethods of getting true time (say Greenwich time) thanthe use of chronometers ; and on the accuracy of theseastronomical methods of getting true time dependedthe successful use of Delisles method. TRAXSnS OF VENUS. 289 Then another difficulty had to be considered, whichaffected both… … completed her entry, or being just about to begin to passoff the suns face. If at this moment Venus presented aneatly defined round disc, exactly touching the edge ofthe sun, also neatly defined, this plan would be perfect.At the very instant when the contact ceased at the entryof Venus, the suns…
Astronomy
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