Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 32
g theobserved movements of the planets, as well as of theSun and Moon, by mathematical formulas, so thattheir position could be calculated and predicted. Thiswas an immense step in the progress of astronomy.A formula, however empirical it may be, which cor-rectly represents the facts, simplifies… … Diag. IX. tion of the movement of Jupiter as given by the Greekgeometricians. Let the point I in Diagram IX make the circuit ofthe sky in 12 years. Represent this by the movementof I round the circumfer-ence of the circle whosecentre is E. Meanwhilelet the point J move rounda circle of \ the radius…
Astronomy
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