Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 255
axis. The popular opinion for many centuries was that the Earthwas a flat disk everywhere surrounded by water. The Earth is not a sphere, but a spheroid. If it is cutby meridian planes (through the poles) the curves cut outof its surface are ellipses, not circles. 234 ASTRONOMY. If an ellipse is… … SOUTH POLE Fig. 149—The Earth—its Axis, its Poles, its Equator. Its equatorial semi-diameter = a = 20,926,202 feet, - 3963.296 miles,= 6,378,190 metres. = b = 20,854,895 feet,= 3949.790 miles,= 6,356,456 metres. = 2a = 7926 6; miles,= 26 = 7899 6 = about 500,000,000 inches. The circumference of the…
Astronomy
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