When was Galileo found guilty of heresy?
Conflict thesis
Pope Urban VIII had been an admirer and supporter of Galileo, and there is evidence he did not believe the inquisition's declaration rendered heliocentrism a heresy. Urban may have rather viewed Heliocentrism as a potentially dangerous or rash doctrine that nevertheless had utility in astronomical calculations. In 1632 Galileo, now an old man, published his "Dialogue Concerning the Two Chief World Systems", which implicitly defended heliocentrism, and was popular. Pope Urban VIII had asked that his own views on the matter be included in Galileo's book, and were voiced by a character named "Simplicio" who was a simpleton. This angered the Pope and weakened Galileo's position politically. Responding to mounting controversy over theology, astronomy and philosophy, the Roman Inquisition tried Galileo in 1633 and found him "vehemently suspect of heresy", sentencing him to indefinite imprisonment. Galileo's "Dialogue" was banned, the publication of his past or future works forbidden, he was ordered to "abjure, curse and detest" heliocentric ideas. Galileo was kept under house arrest until his death in 1642.
Galileo Galilei
The biblical roots of Galileo's name and surname were to become the subject of a famous pun. In 1614, during the Galileo affair, one of Galileo's opponents, the Dominican priest Tommaso Caccini, delivered against Galileo a controversial and influential sermon. In it he made a point of quoting Acts , "Ye men of Galilee, why stand ye gazing up into heaven?".