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 237
stem would exhibit to a spectator at the center of motion. But in order to representcorrectly the positions of the planetary orbits, at any given time,three things must be regarded,—the Inclination of the orbit to thdecliptic—the position of the line of the Nodes—and the position ofike line of the… … Mercury as lying in the same plane with the ecliptic. To exhibitits position justly (AB being taken as the line of the nodes) itshould be elevated on one side about 7° and depressed by thesame number of degrees on the other side, turning on the lineAB as on a hinge. But even then the representation…
Astronomy
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