Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 192
it does not. Roemer discovered that the calculated time for theeclipse of Jupiters satellites varied from the observed tothe extent of 16 minutes and 26.6 seconds. He found thecause of this in the different positions of the earth in itsorbit. Fig. 203 shows the reason for this. J is the planet, and… … Fisr. 203. at R on the opposite side of its orbit, the ray is ER. This islonger than ET by the distance bT, the diameter of the earthsorbit. If now the time of the eclipse was calculated for the pointT, when the earth is at R, the eclipse occurs 16 minutes, 26.6 sec- INTENSITY OF LIGHT. 183 onds…
Physics
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