A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 21
. A Sphere is a globe or lall^ everypart of the surface of which is equidis-tant from a point within, called itscenter. This is the ordinary definition; but in Astronomy, the termis applied to the apparent concave of the heavens, as if it werethe actual concave surface of a hollow sphere. dicular ?… … 18 ASTK0N0MY. A HEMISPHER
Astronomy
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