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 96
Diameter, . 41,848,380 . 7,925ff§ Polar Diameter, 41,708,710 . 7,899^ff Difference in length, about 26^- miles. This difference is but small; yet it proves that the Earthis not a sphere, but an oblate spheroid (see Art. 39). 172. The mean equatorial diameter is given above, forit is found that the… … Fig. -Circle and Ellipses. GIT, a circle. I J, LM, ellipses of differenteccentricities. F, C, foci of L M. £>, E, foci of IJ. is meant by the Polar Diameter of the Earth ? The Equatorial Diameter ? How dothey compare in length? What, then, is the form of the Earth ? 172. Why is the ex-pression…
Astronomy
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