Regiomontanus[58] (1436-1476) after Pürbach's death, continued his work, and his astronomical tables (pub. 1475) were in general use throughout Europe till superseded by the vastly more accurate Copernican Tables a century later. It has been said[59] that his fame inspired Copernicus (born three years before the other's death in 1476) to become as great an astronomer. M. Delambre hails him as the wisest astronomer Europe had yet produced[60] and certainly his renown was approached only by that of the great Cardinal.
Both Janssen,[61] the Catholic historian, and Father Hagen[62] of the Vatican Observatory, together with many other Catholic writers, claim that a hundred years before Copernicus, Cardinal Nicolas Cusanus[63] (c. 1400-1464) had the courage and independence to uphold the theory of the earth's motion and its rotation on its axis. As Father Hagen remarked: "Had Copernicus been aware of these assertions he would probably have been encouraged by them to publish his own monumental work." But the Cardinal stated these views of the earth's motions in a mystical, hypothetical way which seems to justify the marginal heading "Paradox" (in the edition of 1565).[64] And unfortunately for these writers, the Jesuit father, Riccioli, the official spokesman of that order in the 17th century after Galileo's condemnation, speaking of this paradox, called attention, also, to a passage in one of the Cardinal's sermons as indicating that the latter had perhaps "forgotten himself" in the De Docta Ignorantia, or that this paradox "was repugnant to him, or that he had thought better of it."[65] The passage he referred to is as follows: "Prayer is more powerful than all created things. Although angels, or some kind of beings, move the spheres, the Sun and the stars; prayer is more powerful than they are, since it impedes motion, as when the prayer of Joshua made the Sun stand still."[66] This may explain why Copernicus apparently disregarded the Cardinal's paradox, for he made no reference to it in his book; and the statement itself, to judge by the absence of contemporary comment, aroused no interest at the time. But of late years, the Cardinal's position as stated in the De Docta Ignorantia has been repeatedly cited as an instance of the Church's friendly attitude toward scientific thought,[67] to show that Galileo's condemnation was due chiefly to his "contumacy and disobedience."
Copernicus[68] himself was born in Thorn on February 19, 1473,[69] seven years after that Hansa town founded by the Teutonic Order in 1231 had come under the sway of the king of Poland by the Second Peace of Thorn.[70] His father,[71] Niklas Koppernigk, was a wholesale merchant of Cracow who had removed to Thorn before 1458, married Barbara Watzelrode of an old patrician Thorn family, and there had served as town councillor for nineteen years until his death in 1483.[72] Thereupon his mother's brother, Lucas Watzelrode, later bishop of Ermeland, became his guardian, benefactor and close friend.[73]
After the elementary training in the Thorn school,[74] the lad entered the university at Cracow, his father's former home, where he studied under the faculty of arts from 1491-1494.[75] Nowhere else north of the Alps at this time were mathematics and astronomy in better standing than at this university.[76] Sixteen teachers taught these subjects there during the years of Copernicus's stay, but no record exists of his work under any of them.[77] That he must have studied these two sciences there, however, is proved by Rheticus's remark in the Narratio Prima[78] that Copernicus, after leaving Cracow, went to Bologna to work with Dominicus Maria di Novara "non tarn discipulus quam adjutor." He left Cracow without receiving a degree,[79] returned to Thorn in 1494 when he and his family decided he should enter the Church after first studying in Italy.[80] Consequently he crossed the Alps in 1496 and was that winter matriculated at Bologna in the "German nation."[81] The following summer he received word of his appointment to fill a vacancy among the canons of the cathedral chapter at Ermeland where his uncle had been bishop since 1489.[82] He remained in Italy, however, about ten years altogether, studying civil law at Bologna, and canon law and medicine at Padua,[83] yet receiving his degree as doctor of canon law from the university of Ferrara in 1503.[84] He was also in Rome for several months during the Jubilee year, 1500.
At this period the professor of astronomy at Bologna was the famous teacher Dominicus Maria di Novara (1454-1504), a man "ingenio et animo liber" who dared to attack the immutability of the Ptolemaic system, since his own observations, especially of the Pole Star, differed by a degree and more from the traditional ones.[85] He dared to criticise the long accepted system and to emphasize the Pythagorean notion of the underlying harmony and simplicity in nature[86]; and from him Copernicus may have acquired these ideas, for whether they lived together or not in Bologna, they were closely associated. It was here, too, that Copernicus began his study of Greek which later was to be the means[87] of encouraging him in his own theorizing by acquainting him with the ancients who had thought along similar lines.
In the spring of the year (1501) following his visit to Rome,[88] Copernicus returned to the Chapter at Frauenburg to get further leave of absence to study medicine at the University of Padua.[89] Whether he received a degree at Padua or not and how long he stayed there are uncertain points.[90] He was back in Ermeland early in 1506.
His student days were ended. And now for many years he led a very active life, first as companion and assistant to his uncle the Bishop, with whom he stayed at Schloss Heilsberg till after the Bishop's death in 1512; then as one of the leading canons of the chapter at Frauenburg, where he lived most of the rest of his life.[91] As the chapter representative for five years (at intervals) he had oversight of the spiritual and temporal affairs of two large districts in the care of the chapter.[92] He went on various diplomatic and other missions to the King of Poland,[93] to Duke Albrecht of the Teutonic Order,[94] and to the councils of the German states.[95] He wrote a paper of considerable weight upon the much needed reform of the Prussian currency.[96] His skill as a physician was in demand not only in his immediate circle[97] but in adjoining countries, Duke Albrecht once summoning him to Königsberg to attend one of his courtiers.[98] He was a humanist as well as a Catholic Churchman, and though he did not approve of the Protestant Revolt, he favored reform and toleration.[99] Gassendi claims that he was also a painter, at least in his student days, and that he painted portraits well received by his contemporaries.[100] But his interest and skill in astronomy must have been recognized early in his life for in 1514 the committee of the Lateran Council in charge of the reform of the calendar summoned him to their aid.[101]
He was no cloistered monk devoting all his time to the study of the heavens, but a cultivated man of affairs, of recognized ability in business and statesmanship, and a leader among his fellow canons. His mathematical and astronomical pursuits were the occupations of his somewhat rare leisure moments, except perhaps during the six years with his uncle in the comparative freedom of the bishop's castle, and during the last ten or twelve years of his life, after his request for a coadjutor had resulted in lightening his duties. In his masterwork De Revolutionibus[102] there are recorded only 27 of his own astronomical observations, and these extend over the years from 1497 to 1529. The first was made at Bologna, the second at Rome in 1500, and seven of the others at Frauenburg, where the rest were also probably made. It is believed the greater part of the De Revolutionibus was written at Heilsburg[103] where Copernicus was free from his chapter duties, for as he himself says[104] in the Dedication to the Pope (dated 1543) his work had been formulated not merely nine years but for "more than three nines of years." It had not been neglected all this time, however, as the original MS. (now in the Prague Library) with its innumerable changes and corrections shows how continually he worked over it, altering and correcting the tables and verifying his statements.[105]
Copernicus