Ignazio Calandrelli (22 November 1792 – 12 February 1866) was an Italian priest and observational astronomer. He was the nephew of

Giuseppe Calandrelli Giuseppe Calandrelli (22 May 1749 – 24 December 1827) was an Italian priest, astronomer and mathematician. He founded the first astronomical observatory in the Collegio Romano in 1787. An uncle of the astronomer Ignazio Calandrelli, he was am ...

. His main work was in the observations and examinations of the movements of planets and comets. Calandrelli was born in

Rome Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...

to Carlo and Margarita Girella and was the nephew of the astronomer Giuseppe Calandrelli. He studied theology and joined the Gregorian University, receiving a degree in philosophy in 1814 when he became a student of his uncle at the

Collegio Romano The Roman College (, ) was a school established by St. Ignatius of Loyola in 1551, just 11 years after he founded the Society of Jesus (Jesuits). It quickly grew to include classes from elementary school through university level and moved to seve ...

observatory. He was then appointed professor of elementary mathematics and then taught at the Saint Apollinare seminary. In 1838 he became professor of optics and astronomy at Rome and in 1845 took charge of the Bologna Observatory. In 1848 he became director of the Campidoglio observatory. A Merz achromatic telescope (11.4–cm ”aperture, 190–cm focal length) was donated to the observatory by Marquis Giuseppe Ferrajoli (1798–1870) in 1869. He published observations on the movements of planets and comets in the proceedings of the Accademia dei Nuovi Lincei. Otto Wilhelm Struve was critical of the work at the Campidoglio observatory, claiming that work was done only when something caught the fancy of the director Calandrelli.

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Biography in Italian
(with portrait) {{DEFAULTSORT:Calandrelli, Ignazio 1792 births 1866 deaths Italian astronomers