The Artisan, or, Mechanic's instructor : containing a popular, comprehensive and systematic view of the following sciences ... also biographical notices of eminent scientific men, enriched by portraits : with many interesting and valuable articles relating to the mechanical and useful arts : the whole intended as a companion to the institutes (1825)
Carey, George G · London : Printed for William Cole · leaf 123
ards darkish spots. These spots were em- the Sun, that he can only be discerned for ployed by Cassini and Bianchini in de- termining the revolution of Venus about a very short time. When he can be seen, it is a little before the Sun rises in the her axis. morning, and a little after he is set in… … luminary from his centre, her greatest V enus is never seen opposite to the Sun, elongation being about 47°, which proves nor more than 96 times the breadth of that that her orbit includes that of Mercury. When Venus is to the west of the Sun, she * The time which any planet takes to perform its…
