Berry, Arthur,b. 1862 · London, J. Murray · leaf 238
was always proportional to the time. Thus in fig. 6ofthe motion of Mars is most rapid at the point a nearest tothe focus s where the sun is, least rapid at a, and the * An ellipse is one of several curves, known as conic sections,which can be formed by taking a section of a cone, and may also… … Fig. 59.—An ellipse. points on the curve, then the distances s p, h p added together areequal to the distances s q, q h added together, and each sum is equalto the length a a of the ellipse. The ratio of the distance s h tothe length a a is known as the eccentricity, and is a convenientmeasure of…
Astronomy
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