Wilkins, John H. (John Hubbard), 1794-1861, Duke University. Library. Jantz Collection. German Americana · Boston : Hilliard, Gray and Co. · leaf 22
urn on tlieir axes, is vari-ous ; but generally the largest turn quickest. A mirepassing through the centre of an apple properly representsthe axis of a planet. Tlie extremities of an axis are called(poles.) ii.lf the earth were seen from the sun, (PI. J, fig1,) it would appear to describe a circle… … I Of the Solar System in general. 7 whole orbit. While the earth, viewed from the sun,w^ould describe this circle among the stars, the sun, tous on earth, appears to describe precisely the samecircle, only beginning at the opposite point. For whilethe earth actually moves from A to J3, the sun…
Astronomy
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