Georg Joachim Rheticus, a German mathematician and…

Georg Joachim Rheticus, a German mathematician and astronomer and an enthusiastic supporter of Nicolaus Copernicus and his heliocentric theory, spends time with him at Frauenburg and publishes Narratio prima (“A First Account”) in 1540.

Following this publication, Copernicus, now sixty-seven, finally agrees to commit to print the theory already outlined in manuscript form in 1514.