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 91
Fig. 34.—Hokizoxs of the Same Place, at Diffekent Heights. the only figure which, looked at from any external point,is bounded by a circle; and as the horizons of all placesare circular, the Earth is a sphere, or nearly so. 161. What is the Sensible Horizon ? What proof of the Earths roundness does… … *°utm pourFig. 35.—Poles and Equator. 162. Poles, etc.—The Earth isnot only round, but it rotates orturns on an axis, as a top doeswhen it is spinning; and the namesof JSTorth Pole and South Pole aregiven to those points where theaxis would come to the surface ifit were a great iron rod instead ofa…
Astronomy
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