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Updated: June 6, 2025
He begins by mention of the celebrated pigeon of Archytas the Philosopher, and advances one or two theories with regard to the way in which this mechanical bird was constructed, and then he recites, apparently with full belief in it, the fable of Regiomontanus and the eagle that he is said to have constructed to accompany Charles V. on his entry into Nuremberg.
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.
He had been employed at Lisbon in adapting the astrolabe of Regiomontanus for the use of sailors at sea; and in these labours he was assisted by two people who were destined to have a weighty influence on the career of Columbus Doctors Rodrigo and Joseph, physicians or advisers to the King, and men of great academic reputation.
Some of the Indians were alarmed, some of them contemptuous; but it was pretty clearly realised on both sides that matters between them had come to a head; and probably if Regiomontanus, who had worked out these tables of figures and calculations so many years ago in his German home, had done his work carelessly or made a mistake, Columbus and his followers would have been massacred on the spot.
He had been employed at Lisbon in adapting the astrolabe of Regiomontanus for the use of sailors at sea; and in these labours he was assisted by two people who were destined to have a weighty influence on the career of Columbus Doctors Rodrigo and Joseph, physicians or advisers to the King, and men of great academic reputation.
REGIOMONTANUS. A still more irregular walled-plain, of about the same area, closely associated with the S. flank of Purbach, having a rampart of a similar complex type, traversed by passes, longitudinal valleys, and other depressions. Schmidt alone shows the especially fine example of a crater-row, which is not a difficult object, in connection with the S.E. wall.
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.
When the prince's work fell into the hands of his nephew, King John, the latter appointed the German Behaim, of Nuremberg, who lived in Lisbon from 1480 to 1484, to be one of the four members of his "Junto de Mathematicos." It was Behaim who introduced to the Portuguese the improved ephemerides calculated by the German Regiomontanus, and printed at Nuremberg in 1474.
"It is not," lucidly continues the Bishop, "the bigness of any thing in this kind, that can hinder its motion, if the motive faculty be answerable thereunto. We see a great ship swims as well as a small cork; and an eagle flies in the air, as well as a little gnat. This engine may be contrived from the same principles by which Archytas made a wooden dove, and Regiomontanus a wooden eagle.
Regiomontanus and Tycho Brahé proved by their observations that they are situate beyond the moon; Hevelius, Dörfel, &c., made them revolve around the sun; Newton established that they move under the immediate influence of the attractive force of that body, that they do not describe right lines, that, in fact, they obey the laws of Kepler.
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