Proctor, Richard A. (Richard Anthony), 1837-1888 · New York, A.C. Armstrong and son · leaf 300
ly true rate during the hours that thetransit lasted. But it is one thing to construct a time-measure which will not lose or gain a few seconds in a 288 TRANSITS OF VENUS. few hours, and quite another to construct one which willnot lose or gain a few seconds in a journey of many thou-sand miles,… … THE SUN i-^g- 50. tions described to show true time within ten or twelveseconds. Hence astronomers had to provide 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…
Astronomy
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