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Pietro Tacchini was an Italian astronomer.
He was born and raised in Modena, Italy. He studied engineering at the University of Padova. At the age of 21, he was appointed the director of a small observatory in Modena. By 1863 he became the Primo Astronomo Aggiunto, or director of the observatory, at Palermo, Italy. He remained there until 1879, and focused most of his attention on observations of the Sun.
In 1865 he founded the specialist physical astronomy journal, Memorie della Società degli Spettroscopisti, and remained the editor until 1905.
Tacchini established an observation network with other Italian astronomers to spectroscopically examine the sun at about the same time daily. He likewise organized an observatory in Calcutta to watch the sun when conditions were unfavorable in Italy. In 1874 he led an expedition to Muddapur, India to observe the transit of Venus across the sun.
In 1879 he was summoned to Rome where he succeeded Angelo Secchi at the Osservatorio del Collegio Romano. In 1881 he became head of the Ufficio Centrale di Meteorologia.
Due to his influence, the Bellini Observatory was completed on Mount Etna where Pietro believed that the high altitude would improve the spectroscopic observations of the sun, and potentially allow direct observations of the solar corona without an eclipse. He also recommended the construction of the Catania Observatory in 1885.
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