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Today virtually every child grows up learning that the earth orbits the sun.
But four centuries ago, the idea of a heliocentric solar system was so controversial that the Catholic Church classified it as a heresy, and warned the Italian astronomer Galileo Galilei to abandon it.
Many people believe that Galileo was hounded by the church for almost two decades, that he openly maintained a belief in heliocentrism, and that he was only spared torture and death because his powerful friends intervened on his behalf. But an examination of the fine details of Galileo’s conflict with church leaders doesn’t bear that out, according to English department distinguished research professor Henry Kelly.
In an article published this month in the journal “Church History,” Kelly clarifies some popularly held notions around Galileo’s travails with the church.
“We can only guess at what he really believed,” said Kelly, who for his research undertook a thorough examination of the judicial procedure used by the church in its investigation of Galileo. “Galileo was clearly stretching the truth when he maintained at his trial in 1633 that after 1616 he had never considered heliocentrism to be possible. Admitting otherwise would have increased the penance he was given, but would not have endangered his life, since he agreed to renounce the heresy — and in fact it would have spared him even the threat of torture.”
This year marks the 400th anniversary of the beginning of the Catholic Church’s investigation into Galileo.
When first summoned by the Roman Inquisition in 1616, Galileo was not questioned but merely warned not to espouse heliocentrism. Also in 1616, the church banned Nicholas Copernicus’ book “On the Revolutions of the Celestial Spheres,” published in 1543, which contained the theory that the Earth revolved around the sun. After a few minor edits, making sure that the sun theory was presented as purely hypothetical, it was allowed again in 1620 with the blessing of the church.
Sixteen years after his first encounter with the church Galileo published his “Dialogue on the Two World Systems” in 1632, and the pope, Urban VIII, ordered another investigation against him. This time he was prosecuted, following the usual methods of the Roman Inquisition.
First, on April 12, 1633, before any charges were laid against him, Galileo was forced to testify about himself under oath, in the hopes of obtaining a confession. This had long been a standard practice in heresy proceedings, even though it was a violation of the canonical law of inquisitorial due process, Kelly said. However, the interrogation was not successful. Galileo failed to admit any wrongdoing.
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