of hail. He organized the systematic monitoring of the Earth's magnetic field, and in 1858 established a magnetic observatory in Rome. Secchi also performed related technical works for the Papal government, such as overseeing placement of sundials and repair or installation of municipal water systems. In 1854–1855, he supervised an exact survey of the Appian Way in Rome. This survey was later used in the topographic mapping of Italy. He supervised construction of lighthouses for the ports of the Papal States. In 1858, he traveled to France and Germany to procure the necessary projection lenses. Heritage The lunar crater Secchi and the Martian crater Secchi are both named after him, as is a main belt asteroid, 4705 Secchi. The two STEREO (Solar TErrestrial RElations Observatory) spacecraft each carry an instrument package called SECCHI (Sun Earth Connection Coronal and Heliospheric Investigation). See also List of Jesuit scientists List of Roman Catholic scientist-clerics Works (incomplete) During his career, Fr. Secchi published about 730 papers in scientific journals. He also published a number of books. References Attribution Sources https://en.wikisource.org/wiki/Catholic_Encyclopedia_%281913%29/Angelo_Secchi External links 1818 births 1878 deaths People from Reggio Emilia 19th-century Italian astronomers 19th-century Italian Jesuits Italian meteorologists People educated at Stonyhurst College Foreign Members of the Royal Society Members of the French Academy of Sciences Jesuit scientists