parentage (in Polish, Mikołaj Kopernigk). While a student he had come to believe that the Earth revolves around the Sun and not vice versa. Such a view was held to be heretical, the Church regarding the geocentric world view of Aristotle and Ptolemy as consistent with its doctrines. Copernicus set down his basic ideas around 1510 in the Commentariolus, which was circulated anonymously. In 1512–29 he made the observations that he needed to support his theory, while carrying out ecclesiastic and local administrative duties. In 1539 the Austrian astronomer and mathematician Georg Joachim von Lauchen (1514–74), known as Rheticus, became a pupil of Copernicus and began to spread his ideas. The Copernican system was published openly in 1543 in the book De revolutionibus orbium coelestium. However, the reality of a heliocentric Solar System came to be accepted only after the work of Galileo and J. Kepler.