….And the Church’s judgment on the subject in question is that:
(a) to hold that the earth is not the fixed centre of the universe, but orbits the sun, is contrary to a Divinely revealed truth and therefore definitively heretical;
(b) to hold that the earth rotates on its axis is also false and, while not definitely heretical (some authorities think that it is, while others dispute this), certainly a crime against ecclesiastical faith and thus mortally sinful….
..to the reader who is prepared nevertheless to read on, I promise a nice surprise and give some firm assurances. No specialized knowledge is required for an understanding of these three chapters; at the risk of occasionally irritating some readers who are familiar with the subjects under discussion…