Alexandre Guy Pingré detected a four-minute error in Nicolas-Louis de Lacaille’s 1749 lunar eclipse computation, marking his transition from a rural parish priest to a notable figure in French astronomy. Over the following decades, he utilized his mathematical expertise to navigate complex transit observations and historical cometary analysis while balancing his duties as a Catholic canon and academic official.
Ecclesiastical Education and Conflict
Born in 1711 in Paris, Pingré entered the Abbey of St. Vincent in Senlis at age sixteen to begin his religious formation. Following his 1735 ordination, he became a theology professor at the abbey's school. His career faced significant disruption during the 1740s due to his perceived associations with Jansenism. In 1745, King Louis XV mandated that members of the Congregation of Canons Regular of St. Genevieve swear obedience to the papal bull Unigenitus. Because Pingré and his colleagues at Senlis resisted this requirement, he was stripped of his academic responsibilities and relegated to serving in rural parishes.
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Pingré eventually secured a position as the professor of astronomy at the Academy of Rouen in 1749. His career stabilized as he transitioned into the role of librarian at the Abbey of St. Genevieve in Paris, where he operated an observatory for four decades. Despite persistent health issues and poor eyesight, he excelled in mathematical computation. His 1757 publication on the theory and observation of comets cemented his reputation, leading to his appointment as a corresponding member of the French Academy of Sciences and his later service as Chancellor of the University of Paris.
Naval Expeditions and Transit Observations
During the latter half of the eighteenth century, Pingré participated in several high-profile scientific missions. He traveled to Rodrigues Island in 1761 to observe the transit of Venus, though weather rendered the mission unsuccessful. In 1767, he collaborated with Charles Messier in the Baltic region to evaluate marine chronometers. He later joined an expedition to Haiti for the 1769 Venus transit and served on the frigate Flore in 1771 alongside Borda and Verdun de la Crenne to advance naval geography.
Final Years and Legacy
The French Revolution brought significant hardship to Pingré, as the suppression of his monastery left him in a state of poverty. His ability to continue his research and publications in his final years was made possible by a 3,000-franc grant provided by the National Assembly, secured through the intervention of Jérôme Lalande. Pingré died in Paris in 1796. His name is permanently memorialized in the lunar Pingré crater and the asteroid 12719 Pingré.
Fast facts
- Born: 1711, Paris
- Died: 1 May 1796, Paris
- Primary Fields: Astronomy, Geography, Library Science
- Academic Roles: Professor of Astronomy, Chancellor of the University of Paris
- Professional Memberships: French Academy of Sciences, Göttingen Academy of Sciences and Humanities
- Languages: French, Latin
Questions readers ask
What were Pingré's primary occupations?
He was an astronomer, naval geographer, composer, librarian, and a canon regular of the Catholic Church.
Why was Pingré removed from his position in 1745?
He and other canons of Senlis refused to swear an oath of obedience to the papal bull Unigenitus, which condemned Jansenist teachings.
Achievements
- Recorded as astronomer, librarian and composer
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