page_title: Role of Christianity in civilization
section_title: Astronomy
hierarchical_section_title: Role of Christianity in civilization / Letters and learning / Astronomy
caption_attribution_description: English: Vatican Observatory Telescope on the roof of the Ponticial Palace in Castel Gandolfo
context_page_description: Christianity has been intricately intertwined with the history and formation of Western society. Throughout its long history, the Church has been a major source of social services like schooling and medical care; an inspiration for art, culture and philosophy; and an influential player in politics and religion. In various ways it has sought to affect Western attitudes towards vice and virtue in diverse fields. Festivals like Easter and Christmas are marked as public holidays; the Gregorian Calendar has been adopted internationally as the civil calendar; and the calendar itself is measured from the date of Jesus's birth.
  The cultural influence of the Church has been vast. Church scholars preserved literacy in Western Europe following the Fall of the Western Roman Empire. During the Middle Ages, the Church rose to replace the Roman Empire as the unifying force in Europe. The medieval cathedrals remain among the most iconic architectural feats produced by Western civilization. Many of Europe's universities were also founded by the church at that time. Many historians state that universities and cathedral schools were a continuation of the interest in learning promoted by monasteries.
context_section_description: Historically, the Catholic Church has been a major a sponsor of astronomy, not least due to the astronomical basis of the calendar by which holy days and Easter are determined. Nevertheless, the most famous case of a scientist being tried for heresy arose in this field of science: the trial of Galileo.
  The Church's interest in astronomy began with purely practical concerns, when in the 16th century Pope Gregory XIII required astronomers to correct for the fact that the Julian calendar had fallen out of sync with the sky. Since the Spring equinox was tied to the celebration of Easter, the Church considered that this steady movement in the date of the equinox was undesirable. The resulting Gregorian calendar is the internationally accepted civil calendar used throughout the world today and is an important contribution of the Catholic Church to Western Civilisation. It was introduced by Pope Gregory XIII, after whom the calendar was named, by a decree signed on 24 February 1582. In 1789, the Vatican Observatory opened. It was moved to Castel Gandolfo in the 1930s and the Vatican Advanced Technology Telescope began making observation in Arizona, US, in 1995.
  The famous astronomers Nicholas Copernicus, who put the sun at the centre of the heavens in 1543, and Galileo Galilei, who experimented with the new technology of the telescope and, with its aid declared his belief that Copernicus was correct, were both practising Catholics –  indeed Copernicus was a Catholic clergyman. Yet the church establishment at that time held to theories devised in pre-Christian Greece by Ptolemy and Aristotle, which said that the sky revolved around the earth. When Galileo began to assert that the earth in fact revolved around the sun, he therefore found himself challenging the Church establishment at a time where the Church hierarchy also held temporal power and was engaged in the ongoing political challenge of the rise of Protestantism. After discussions with Pope Urban VIII (a man who had written admiringly of Galileo before taking papal office), Galileo believed he could avoid censure by presenting his arguments in dialogue form, but the Pope took offence when he discovered that some of his own words were being spoken by a character in the book who was a simpleton and Galileo was called for a trial before the Inquisition.
  In this most famous example cited by critics of the Catholic Church's "posture towards science", Galileo Galilei was denounced in 1633 for his work on the heliocentric model of the solar system, previously proposed by the Polish clergyman and intellectual Nicolaus Copernicus. Copernicus's work had been suppressed de facto by the Church, but Catholic authorities were generally tolerant of discussion of the hypothesis as long as it was portrayed only as a useful mathematical fiction, and not descriptive of reality. Galileo, by contrast, argued from his unprecedented observations of the solar system that the heliocentric system was not merely an abstract model for calculating planetary motions, but actually corresponded to physical reality –  that is, he insisted the planets really do orbit the Sun. After years of telescopic observation, consultations with the Popes, and verbal and written discussions with astronomers and clerics, a trial was convened by the Tribunal of the Roman and Universal Inquisition. Galileo was found "vehemently suspect of heresy" (not "guilty of heresy", as is frequently misreported), placed under house arrest, and all of his works, including any future writings, were banned. Galileo had been threatened with torture and other Catholic scientists fell silent on the issue. Galileo's great contemporary René Descartes stopped publishing in France and went to Sweden. According to Polish-British historian of science Jacob Bronowski:
  The effect of the trial and imprisonment was to put a total stop to the scientific tradition in the Mediterranean. From now on the Scientific Revolution moved to Northern Europe.
  Pope John Paul II, on 31 October 1992, publicly expressed regret for the actions of those Catholics wh
caption: Vatican Observatory Telescope in Castel Gandolfo.
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