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 30
parallel to it, which,passing through the earths cen-ter, divides it into upper and lower hemispheres. 1. These hemispheres are distinguished as upper and lower with reference to the ob-server only. 20. Celestial sphere ? (Relation to terrestrial ?) Axis of the heavens ?Equator of the heavens ?… … DEFINITIONS. 27 2. The sensible horizon is half the diameter of the earth, or about 4,000 miles fromthe rational; and yet so distant are the stars, that both these planes seem to eut thecelestial arch at the same point: and we sec the same hemisphere of stars above thesensible horizon of any place…
Astronomy
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