June 20

The Interrogation of Galileo

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On this day in, 1633, Galileo Galilei sat in confinement at the offices of the Roman Inquisition, seventy years old, his health failing, with no idea precisely what the next day would bring. He knew it would be bad. Two days earlier, on June 16, Pope Urban VIII had personally ordered that Galileo be examined on his true beliefs regarding the motion of the Earth—and that if necessary, the examination should proceed under threat of physical torture. On June 21, that examination would take place. On June 22, he would be made to kneel in the convent of Santa Maria sopra Minerva and renounce, under oath, the thing he knew to be true about the universe.

June 20 was the held breath between the order and its execution. It was the last full day before Galileo Galilei, the man who had pointed a telescope at the heavens and seen mountains on the Moon, moons around Jupiter, and phases on Venus that no Aristotelian cosmology could explain, would be broken by the institution that had once celebrated his discoveries and now needed him silenced.

In 1610, using a telescope of his own improvement, he observed four moons orbiting Jupiter—proof that not everything in the heavens circled the Earth. He observed that Venus showed phases, exactly as it would if it orbited the Sun rather than the Earth. He saw mountains and craters on the Moon, demonstrating that the heavenly bodies were not the smooth, perfect, incorruptible spheres that Aristotelian cosmology demanded. Each discovery chipped away at a thousand-year-old architecture of the universe in which Earth sat motionless at the center of creation and the heavens above were categorically different from the corrupt world below.

This was not merely an astronomical dispute. It was a direct challenge to the medieval cosmological order—the same order, in fact, that the Canterbury monks had relied upon in 1178 when they watched the moon writhe and feared the heavens were unraveling. Galileo’s telescope made that unraveling literal and undeniable. The perfect, unchanging celestial spheres had craters. The fixed point at the center of creation was wrong. If the Earth moved, then humanity’s privileged, central place in the cosmic order moved with it—and an enormous structure of theology, philosophy, and political authority had been built on the assumption that it never would.

The First Warning

Galileo had been here before. In 1616, the Inquisition’s qualifying theologians declared the proposition that the Sun stood motionless at the center of the universe to be “foolish and absurd in philosophy, and formally heretical.” Cardinal Robert Bellarmine, one of the most respected theologians in Rome, personally ordered Galileo to abandon the Copernican view entirely—not merely to refrain from teaching it, but to cease holding or defending it in any form, “either orally or in writing.”

Galileo accepted the order, but accepted it the way a man accepts a stay of execution. He continued his work quietly, and in 1623 a sympathetic new pope, Urban VIII—a former friend and patron—ascended to the papacy. Urban gave Galileo permission to write about the Copernican system again, with one essential condition: it had to be presented as hypothesis, not physical fact. Galileo, ever certain of what his telescope had shown him, found this condition difficult to honor convincingly.

In 1632, Galileo published Dialogue Concerning the Two Chief World Systems—structured as a conversation between three men: Salviati, the eloquent Copernican; Sagredo, the witty and persuadable neutral party; and Simplicio, the dim, stubborn defender of the old Aristotelian Earth-centered universe, whose arguments are systematically dismantled and mocked across four hundred pages. Urban VIII had insisted that his own theological arguments for geocentrism be included in the book. Galileo complied—by placing them in the mouth of Simplicio, the fool.

Whether or not Galileo intended this as a deliberate insult to the Pope, Urban’s circle took it as one. The patronage that had protected Galileo for a decade collapsed. The book’s sale was banned within months of publication, and a commission was convened to determine whether the matter required referral to the Inquisition. It did. By 1633, Galileo was once again standing—this time formally, dangerously—before the institution that had warned him seventeen years before. The trial proper had taken place on May 10; Galileo had already offered a formal defense, including Bellarmine’s 1616 certificate stating that he had not been declared a heretic, only instructed to avoid teaching heliocentrism as established fact. It was not enough. On June 16, Pope Urban personally ordered that Galileo be questioned about his true intentions concerning the Copernican doctrine—and crucially, that this questioning include the threat of torture, a standard inquisitorial procedure for probing whether a confession was sincere or merely strategic.

Galileo spent June 20 with this knowledge. He had confessed once already, on April 30, to having favored the heretical view while denying that he had truly intended to promote it—a confession that satisfied no one and settled nothing. Now he waited for the formal examination that the Pope had personally mandated, under conditions designed to strip away any possibility of strategic ambiguity. Whatever Galileo believed about the structure of the universe, by June 21 he would be made to state, under threat of physical pain, exactly what that belief was. The following day, the examination took place. Galileo maintained that he had never truly held the Copernican view as physically true, only investigated it as a hypothesis—a position his own book made difficult to credit, given how thoroughly Simplicio’s Aristotelian arguments were demolished by Salviati’s Copernican ones. The examination proceeded, the threat held over him throughout, though there is no definitive historical record that physical torture was actually applied. On June 22, in the convent of Santa Maria sopra Minerva, seven of ten cardinal inquisitors signed his sentence: vehement suspicion of heresy. He was made to kneel, his hands on the Gospels, and recite a formal abjuration—cursing and detesting the opinion that the Sun stood still and the Earth moved.

A New Theory

Historian Pietro Redondi argued in 1983 that the deeper motive for Galileo’s prosecution may not have been heliocentrism at all, but a buried accusation that his atomist theory of matter—laid out in his 1623 work The Assayer—was incompatible with the Catholic doctrine of transubstantiation, the literal transformation of bread and wine into the body and blood of Christ during the Mass. An anonymous denunciation discovered in the Vatican archives raised precisely this charge. If Redondi is correct, the Inquisition’s public case against Galileo—the Sun, the Earth, the heavens—may have functioned partly as a shield, deflecting attention from a far more theologically dangerous question about the fundamental nature of matter itself, and the doctrine that depends on its transformation.

Most historians of science remain skeptical of Redondi’s theory. But the fact that it remains debatable at all tells us something true about the Galileo affair regardless of which layer was primary: this was never simply a dispute between observation and dogma. It was a contest over who held the authority to say what was real—the trained eye looking through a new instrument, or the inherited interpretation of ancient text. Both heliocentrism and atomism threatened the same thing: a cosmology in which matter behaved according to fixed, divinely sanctioned categories that human observation was not permitted to revise.

Popular legend holds that Galileo, rising from his knees after the abjuration, muttered under his breath: “Eppur si muove”—and yet it moves. There is no contemporary evidence that he said this. The phrase first appears in historical record a century after his death, and shows up in a 1640s painting of an imprisoned Galileo pointing to the words scrawled on his dungeon wall. The legend is almost certainly invention. It has survived for nearly four hundred years anyway, because it expresses something true even if Galileo never said it: the Earth did not stop moving because a tribunal of cardinals declared that it had to.

Galileo spent the remaining nine years of his life under house arrest at his villa in Arcetri, growing blind, continuing his work in mechanics in defiance of the publication ban, smuggling his final masterwork to Holland for printing because no press in Italy would touch it. In 1992, nearly three hundred sixty years later, Pope John Paul II acknowledged that the theologians who opposed Galileo had erred—not by lacking faith, but by mistaking their own reading of scripture for an accurate description of the physical world.

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