Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 176
the Planets; i.e.. their motionswith respect to the earth regarded as the centre of observation. While the planets revolve regularly in nearly circular orbitsaround the sun. with velocities 1 which depend upon their dis-tance from it. the motions relative to the earth are very dif-ferent, being… … with the apparent motion due to that of the earth in her ownorbit. If, for instance, we keep up observations, for a long time, ofthe direction of Jupiter as seen from the earth, at the sametime watching the changesof its distance by measur-ing the alterations of theplanets apparent size asseen in…
Astronomy
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