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Updated: June 6, 2025
Contemporary with Cusanus was Regiomontanus, who has been proclaimed the father of modern astronomy, and a distinguished mathematician. Toscanelli, the Florentine astronomer, whose years run almost parallel with those of the fifteenth century, did fine scholarly work, which deeply influenced Columbus and the great navigators of the time.
The people who probably helped him most in this were his brother Bartholomew and Martin Behaim, the great authority on scientific navigation, who had been living in Lisbon for some time and with whom Columbus was acquainted. Behaim, who was at this time about forty eight years of age, was born at Nuremberg, and was a pupil of Regiomontanus, the great German astronomer.
There were professors of cosmography and astronomy in the university, familiar with the works of Alfraganus and Regiomontanus. It is likely that it was at this time that Columbus became possessed of d'Ailly's 'Imago Mundi', which little volume contained a popular resume of the scientific views of Strabo, Pliny, Ptolemy, and others, and was from this time forth Columbus's constant companion.
We have already stated that the astrolobe, which had been previously applied only to astronomical purposes, was accommodated to the use of mariners by Martin Behaim, towards the end of the fifteenth century. He was a scholar of Muller, of Koningsberg, better known under the name of Regiomontanus, who published the Almagest of Ptolemy.
In this observation there is an error of eighteen degrees, the true longitude of the island of Saona, where the observation was taken, being 62 deg. 20' west of Cadiz; and the error is accounted for partly by the inaccuracy of the tables of Regiomontanus and partly by the crudity and inexactness of the Admiral's methods.
Among his small library in the cabin of the ship was the book containing the astronomical tables of Regiomontanus; and from his study of this work he was aware that an eclipse of the moon was due on a certain date near at hand.
But Regiomontanus, God bless him! had made no mistake. Sure enough, and punctually to the appointed time, the dark shadow began to steal over the moon's disc; its light gradually faded, and a ghostly darkness crept over the face of the world.
There were professors of cosmography and astronomy in the university, familiar with the works of Alfraganus and Regiomontanus. It is likely that it was at this time that Columbus became possessed of d'Ailly's 'Imago Mundi', which little volume contained a popular resume of the scientific views of Strabo, Pliny, Ptolemy, and others, and was from this time forth Columbus's constant companion.
But Regiomontanus, God bless him! had made no mistake. Sure enough, and punctually to the appointed time, the dark shadow began to steal over the moon's disc; its light gradually faded, and a ghostly darkness crept over the face of the world.
This fact is shown by the tables of Regiomontanus, which had been published long before the alleged voyage, and were open to the world. The statement of it here, therefore, does not, as has been supposed, furnish any evidence in support of the narrative, by redeem of its originality.
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