For eight years, until Peurbach's death, the two astronomers did excellent work together.In Theoricae Novae Planetarum (New theories of the planets), which he completed by 30 August 1454, Peurbach presented Ptolemy's theory of the planets in an elementary but thorough way.The work consequently tends to look "medieval", a characteristic that may perhaps partly account for its long neglect by translators. went into at least fifty-six printed editions between 14 (counting translations and commentaries as well as editions of the original Latin text).
By 1453 Peurbach was back in Vienna and there he was awarded a Master's Degree on 28 February.He had already acquired an international reputation as an astronomer despite having no publications at that time. netdating dk Lolland He lectured in Germany, France and Italy on astronomy and after giving lectures in Bologna and Padua he was offered appointments in these universities but turned them down.J V Field writes:- The astronomy Peurbach teaches is that of planetary spheres, the motion of each planet being shown by circles (standing for spheres) rolling one inside the other.The theory is derived from Ptolemy but also from Islamic astronomers.
Peurbach believed that the planets were in solid crystalline spheres although he believed that their motions were controlled by the Sun.The book was based on lecture notes of a course given by Peurbach at the University of Vienna earlier in 1454.Regiomontanus was a student at the University of Vienna where he was taught by Peurbach. He graduated at the age of fifteen and in the following year of 1453 he began collaborating with Peurbach.The last astronomer to teach at the University of Vienna was John of Gmunden who died four years before Peurbach matriculated there, but the university still held his library and instruments to which Peurbach probably was given access.