The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 92
* If we know the periodic time of Venus and that of the earth, the ratioof the distances of these two planets from the sun can be obtained by KeplersThird Law (Art. 117), that the squares of the periodic times of any twoplanets are proportional to the cubes of their mean distances from the sun. 86… … Fig. 36. of the earth. Let HK be that diameter of the earth which isperpendicular to the plane of the ecliptic, and let an observer besupposed to be stationed at each extremity. In order to simplifythe explanation, let us neglect the rotation of the earth duringthe observation, and suppose Venus to…
Astronomy
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