The case of Galileo Galilei is one of the most representative episodes of the clash between science and religion in modern history.
In 1633, this Italian astronomer, mathematician, and physicist was summoned before the Roman Inquisition to address the heliocentric model of the solar system, which placed the Sun at the center and the Earth in motion.
Although the formal trial took place in the spring, a key event in this process occurred in February 1633, when Galileo arrived in Rome to answer to the ecclesiastical tribunal.
Historical context: science and the Church
Galileo Galilei (1564–1642) was one of the pioneers of modern science thanks to his astronomical observations with a telescope. Among them, the phases of Venus and the moons of Jupiter, which supported the heliocentric model proposed by Nicolaus Copernicus in 1543.
The Catholic Church, in the context of the 17th century, continued to defend the traditional geocentric system—which placed the Earth at the center of the universe—as a doctrinal interpretation compatible with the literal reading of the Holy Scriptures. Therefore, any position that seemed to contradict that approach could be considered heresy.
February 13, 1633: Galileo arrives in Rome
On February 13, 1633, Galileo Galilei arrived in Rome to appear before the Inquisition, after having been summoned by the Holy See.
His journey from Florence had been long and difficult due to his age (he was almost 69 years old) and the adverse winter conditions.
Although the formal trial was not held in February, the arrival in Rome was a decisive moment in the inquisitorial process.
Galileo was housed at the Tuscan embassy and was forbidden to associate freely while awaiting the start of the sessions; in other words, this was when he lost his freedom.
The Inquisition and the formal start of the trial
The trial began officially on April 12, 1633, before the master inquisitor Vincenzo Maculano da Firenzuola, appointed by Pope Urban VIII.
Galileo was interrogated for publicly maintaining and defending heliocentrism, despite having received an order in 1616 to refrain from teaching or propagating that theory.
During the sessions, the tribunal examined his work Dialogo sopra i due massimi sistemi del mondo (1632), where he compared the geocentric and heliocentric systems.
Although Galileo attempted to argue that his work was merely a discussion, the tribunal found him guilty of "vehement suspicion of heresy" for holding notions contrary to the literal interpretation of the Bible.
Sentence and consequences
On June 22, 1633, the Inquisition condemned Galileo to publicly abjure his support for heliocentrism and sentenced him to life imprisonment. However, the Pope permitted the sentence to be commuted to house arrest at his villa in Arcetri, near Florence, where Galileo spent the rest of his life until his death in 1642.
It is said that, although he signed the abjuration under pressure from the Inquisition, he muttered the famous phrase “Eppur si muove”, “And yet, it moves”.
His work was banned and added to the Index of Prohibited Books.
It was also mandated that he not teach or defend heliocentrism in public.
The Church maintained the ban on his heliocentric writings until the 19th century, and it was not until 1992 that the Church itself officially acknowledged that Galileo was right about the movement of the Earth.
Historical impact and scientific legacy
The case of Galileo Galilei marked a turning point in the relations between science, religion, and authority in the West.
His defense of observation, empirical evidence, and the scientific method influenced later generations, including scientists like Isaac Newton, whose work on universal gravitation would be built upon the foundations laid by Galileo.
The confrontation between emerging science and religious institutions symbolizes the transition from medieval thought to modern thought, in which scientific research began to break free from doctrinal restrictions.
Galileo became a symbol of intellectual freedom, and his trial remains an example of the tensions between authority and knowledge.
