Chapter 1, Spain At The Flood
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The situation of Castile and Aragón at the beginning of a united Spain is discussed in J. H. Elliott, The Revolt of the Catalans: A Study in the Decline of Spain, 1598-1640 (Cambridge University Press, Cambridge, 1963), pp. 1-7. Another detailed discussion can be found in J. Ramsey, Spain: The Rise of the First World Power (Office of International Studies and Programs and the University of Alabama Press, 1973), esp. pp. 116-78. For the Nasrids in Spain, see W. M. Watt and P. Cachia, A History of Islamic Spain (Edinburgh University Press, Paperbacks, 1977 [first published 1965], Edinburgh, U.K.), pp. 147-50.
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Eratosthenes arrived at his estimated circumference of the Earth by measuring its arc between Syene near Elephantine in upper Egypt and Alexandria in lower Egypt. He measured the angle of the sun at noonday in the two places, and decided that they were separated by one-fiftieth of the Earth's circumference. The distance between the two places he estimated at 5,000 stadia, making the circumference of the Earth 250,000 stadia (later "corrected" to 252,000 stadia). Unfortunately, there are several values for a Greek stadium, so modern estimates for Eratosthenes's circumference vary from about 24,000 to almost 29,000 miles, compared to the actual circumference of a little less than 25,000 miles In any case, considering the primitive nature of his instruments, Eratosthenes's figure is remarkable. Consult G. Sarton, A History of Science: Hellenistic Science and Culture in the Last Three Centuries B.C. (Harvard University Press, Cambridge, Mass., 1959), pp. 103-6.
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For early exploration in the Atlantic, see the two volumes of S. E. Morrison's The European Discovery of America: The Northern Voyages (Oxford University Press, New York and Oxford, 1971) and The Southern Voyages (Oxford University Press, New York and Oxford, 1974). Also consult two books by C. O. Sauer: The Early Spanish Main (University of California Press, Berkeley, 1966) and Northern Mists (University of California Press, Berkeley, 1968). See also J. B. Brebner, The
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