Angelo Secchi (; 28 June 1818 – 26 February 1878) was an Italian Catholic priest, astronomer from the Italian region of Emilia. He was director of the observatory at the Pontifical Gregorian University (then called the Roman College) for 28 years. He was a pioneer in astronomical spectroscopy, and was one of the first scientists to state authoritatively that the Sun is a star. Biography Secchi was born in Reggio Emilia, where he studied at the Jesuit gymnasium. At the age of 16, he entered the Jesuit Order in Rome. He continued his studies at the Roman College, and demonstrated great scientific ability. In 1839, he was appointed tutor of mathematics and physics at the college. In 1841, he became professor of physics at the Jesuit College in Loreto. In 1844, he began theological studies in Rome, and was ordained a priest on 12 September 1847. In 1848, due to the Roman Revolution, the Jesuits were ordered to leave Rome. Angelo Secchi spent the next two years in the United Kingdom at Stonyhurst College, where he met the Jesuit astronomer, Alfred Weld in charge of the Stonyhurst Observatory, who may have inspired him to take up the science. He moved on to the United States, where he taught for a time at Georgetown University in Washington, D.C. He also took his doctoral examination in theology there. During his stay in America, he met Commander Matthew Fontaine Maury, the first director of the United States Naval Observatory in Washington. He studied with Maury and corresponded with him for many years. He returned to Rome in 1850. On the recommendation of his late colleague Francesco de Vico, he became head of the observatory of the college at age 32. In 1853, under his direction, the crumbling observatory was relocated to a new facility on top of the Sant'Ignazio Church (the chapel of the college). Secchi served as director until his death. Secchi was elected to the American Philosophical Society in 1860. His position was challenged after 1870, when the remnant of the Papal States around Rome was taken over by the Kingdom of Italy. In 1873, the college was declared property of the Italian government. When the government moved to take over the observatory as well, Secchi protested vigorously, and threatened to leave the observatory for one of several positions offered to him by foreign observatories. He was offered important scientific positions