Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 53
hypothesis, but couldnot by systems of epicycles represent Tychos obser-vations with sufficient accuracy. He then tried otherforms of curves, a daring innovation, as it was univers-ally believed that the celestial motions must be com-posed of circular movements. Each different hypo-thesis involved… … Diag. XXII. tried the ellipse, and found that with the Sun inone of the foci he could adequately represent Tychosobservations. The ellipse is the curve which is ob-tained when a cone is cut obliquely. It may also beconsidered as the curve which a point P describes ifit moves so that the sum of its…
Astronomy
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