Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 149
d of an inferior planet is longer thanits sidereal period. This will be evident from an examina-tion of Fig. 147. ^ is the position of the sun, E that ofthe earth, and P that of the planet at inferior conjunc-tion. Before the planet can be in inferior conjunctionagain, it must pass entirely around… … ASTRONOMY. I33 Now the arc PF is just equal to the arc EEr: hence theplanet has to pass over the same arc that the earth does,and 3600 more. In other words, the planet has to gain3600 on the earth. The synodical period of the planet is found by directobservation. 129. The Length of the Sidereal…
Astronomy
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