An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 239
complicated than the heliocentric, as will be evidentfrom the following diagram, which represents the geocentric mo- 214 THE PLANETS. tions of Mercury for two entire revolutions, embracing a periodof nearly six months. Let S (Fig. 66,) represent the sun, 1, 2,3, &c. the orbit of Mer-cury, a, h,… … orbit described by that body in the time that Mercury describesthe two complete revolutions, is divided into 24 equal parts. Letus now suppose that Mercury is at the point 1 in his orbit, whenthe earth is at the point a ; Mercury will then appear in the heav-ens at A. In 71 days Mercury will have…
Astronomy
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