Purbach and Mullerus, in the fifteenth century, contributed most to the advancement of astronomy in their day.
Unfortunately, however, Purbach died before his journey to Rome.
Purbach deserves the name that has been given him of the father of mathematical astronomy in modern times.
He offered to secure them and also to provide for Purbach's support during the stay in Rome necessary for the study.
Purbach had computed a table of sines to a radius of 600,000 parts.