Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 286
ee shaded areas are equal,—the partof the orbit intercepted being shortest where the radius-vec- lation reveal to Newton ? 507. What is meant by Keplers Laws ? Give Keplersthree laws. 508. What was stated in Art. 301 ? What does Keplers second lawenable us to find ? What is the Radius-vector of a… … Fig. 105.—Illustration of Keplers Second Law. tor is longest,as must be thecase in order tomake the areasequal. The arcsAB, CD, andEF, are re-sp e ctivelythose describedat perihelion,at aphelion,and at meandistance, and according to the second law they are trav-ersed in equal times. Therefore, as a…
Astronomy
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