Popular astronomy : a concise elementary treatise on the sun, planets, satellites and comets (1865)
Mitchel, O. M. (Ormsby MacKnight), 1809-1862 · New York : Oakley & Mason · leaf 152
must continue to be direct, until the earth cominground again to occupy the conjunction line, previous towhich the stationary point will be passed, and the retro-gradation will be commenced. The distance of any planet from the sun, in terms ofthe earths distance, may bo obtained from a measure-ment… … in which S is the sun, E and P the places of the earthand planet on the day of opposition, E and P theirplaces at the end of twenty-four hours. E E^ and P Pmdy be regarded as straight lines, as they are very shortin comparison with the entire circumference. As we aresupposed to know the periods of…
Astronomy
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