. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. Fig. 9. Aristarchuss Method of Determining the Distance fromTHE Earth to the Sun. To Eratosthenes, 2d century , is due the first measure-ment of the size of the Earth. At noonday, at the summersolstice, the sun shone vertically down a well at Syene, inUpper Egypt, while in Alexandria, at the same time, the. Fig. 1—The Well of Eratosthenes.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectastronomy, bookyear19