The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 64
the study ASTRONOMY. 45 of Tychos observations, for the purpose of discovering thetrue laws of planetary motion. He banished the compli-cated system of cycles, epicycles, and eccentrics forever fromthe heavens, and discovered the three laws of planetarymotion which have rendered his name immortal.… … Fig. 52. One method of describing an ellipse is shown in Fig. 53.Two tacks, E and E, are stuck into a piece of paper, andto these are fastened the two ends of a string which is longerthan the distance between the tacks. A pencil is thenplaced against the string, and carried around, as shown inthe…
Astronomy
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