Evershed, M. A. (Orr) · London : Gall & Inglis · leaf 229
urus has a diameter far greater, some say ten times,some not less than twenty-five times as great as the sun ! ^ The mean length of Earths shadow (which varies a little with herdistance from the sun,) is 857,000 miles, or 216 times her semi-diameter. 192 ARAB ASTRONOMY. this—since the size was… … Earth small and nearifstant Fig. 37. Earths Shadow. The two last chapters are devoted to eclipses, lunarand solar, and Alfraganus points out that, unlike lunareclipses, eclipses of the sun vary in duration and magni-tude according to the place on Earth from which theyare viewed. The book concludes:…
Dante Alighieri, 1265-1321 · Astronomy
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