Background
He was born on March 20, 1816 at Florence, Italy.
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Astronomer mathematician priest
He was born on March 20, 1816 at Florence, Italy.
He received his earlier education at the Scuola Pia, near his native town. In 1839 he began his philosophical and theological studies at the Roman College and here was privileged to have as professor Fr. Andrea Caraffa, one of the leading mathematicians of his time, who materially encouraged him in the prosecution of the researches of his choice.
At the age of eighteen he was appointed assistant to Fr. Inghirami, then the director of the Osservatorio Ximeniano, at Florence. On October 30, 1836, he entered the Society of Jesus at Rome.
On the advice of Caraffa he was assigned as assistant astronomer of the Roman Observatory, then under the directorship of Fr. M. DeVico, whose name is identified with one of the periodic comets. During his incumbency at this observatory, which lasted till 1848, Sestini made a special study of star colors and his results were published under the titles Memoria Sopra i Colori delle Stelle del Catalogo di Baily Osservati (1845) and Memoria Seconda Intorno ai Colori delle Stelle (1847). He was ordained to the priesthood in 1844.
Following the outbreak of the Revolution in Rome in 1848, he emigrated to the United States and became connected with Georgetown University, Washington, where, at the observatory of the University, he resumed his researches. From September 20 to November 6 of that year, he was able to follow the sun spots, then very pronounced, noting the rate of travel over the surface and the changes in their appearances and, being a skilled draftsman, to commit them to paper. Engravings of the sketches were published in an appendix to Astronomical Observations Made During the Year 1847 at the National Observatory, Washington, vol. III (1853).
In addition to his researches in astronomy, Sestini taught mathematics and natural sciences to the Jesuit seminarians then resident at Georgetown College.
In 1878 he organized an expedition to Denver, Colorado, for the observation of the total eclipse of the sun, an account of which was published in the American Catholic Quarterly Review (October 1878). In 1866 he began the publication of the Messenger of the Sacred Heart.
He remained at Georgetown till 1869, except for a year spent at Frederick devoted to studies in ascetic theology, three years at Boston College, and two years at Gonzaga College, Washington, in which institution he taught higher mathematics. From 1869 to 1885 he gave instruction in astronomy and geology at Woodstock.
In the latter year his health became impaired and he was forced to resign the editorship of the Messenger of the Sacred Heart. He thereupon entered into retirement at the Jesuit novitiate at Frederick, Maryland, where, having suffered a severe stroke of paralysis, he died.
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