Mattison, Hiram, 1811-1868 · New York, Huntington and Savage, Mason and Law · leaf 35
may be understood by the annexeddiagram, in which the stars surround the earthin all directions, as they seem to fill the wholecelestial vault.] 115. What is the Equinoctial ?It is the Celestial Equator, or the plane of the earths equator extend-ed in every direction to the starryheavens. 116. What… … PRIMARY ASTRONOMY. 29 It is distance east of a given point, and is reckonedon the Equinoctial quite around the heavens. [hi one respect Right Ascension in the heavens is like longitude on the earth:they are both reckoned upon the equators of their respective spheres; but whilelongitude is reckoned…
Astronomy
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