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Apart from its adoption of the theory that the earth was globular, not round and flat, Behaim's map shows little advance upon Fra Mauro, except that it gives a clearer idea of the shape of Africa, due to the earlier explorations of the Portuguese.
Behaim's globe, which was completed in the year 1492, represented the farthest point that geographical knowledge had reached previous to the discoveries of Columbus, and on it is shown the island of Cipango or Japan.
For this, Magellan entered the straits, which, strangely enough, he affirmed before setting out, that he "would enter," since he "had seen them marked out on the geographer Martin Behaim's globe."
How much beyond that island, in its supposed geographical position, Columbus expected to find the Asiatic main we can only conjecture from the restorations which modern scholars have made of Toscanelli's map, which makes the island about 10° east of Asia, and from Behaim's globe, which makes it 20°. It should be borne in mind that the knowledge of its position came from Marco Polo, and he does not distinctly say how far it was from the Asiatic coast.
That Magellan did not himself believe the strait was laid down in Behaim's chart from any authority is evident, from a circumstance mentioned by Pigafetta, who expressly informs us, that Magellan was resolved to prosecute his search after it to latitude 75°, had he not found it in latitude 52°. Now, as Behaim undoubtedly was the greatest cosmographer of the age, and had been employed to fit the astrolobe as a sea instrument, it is not to be supposed that, if he had good authority for the existence of a passage round South America, he would have left it in any chart he drew, with an uncertainty of 23 degrees.
Behaim's globe, which was completed in the year 1492, represented the farthest point that geographical knowledge had reached previous to the discoveries of Columbus, and on it is shown the island of Cipango or Japan.
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