Angelo Secchi was a key figure in 19th century science. An Italian Jesuit and scientist, he helped lead the transition from astronomy to astrophysics and left a lasting legacy in the field. Secchi’s spectral classification of stars was a milestone that paved the way for modern astronomical research. He was also a founder of modern meteorology and an innovator in the design and development of new instruments and methods across disciplines.This contributed volume collects together reviews from an international group of historians, scientists and scholars representing the multiple disciplines where Secchi made significant contributions during his remarkable career. It analyzes both his famous and lesser known pioneering efforts with equal vigor, providing a well-rounded narrative of his life’s work. Beyond his scientific and technological work, his role as a Jesuit priest in Rome during the turbulent years of the mid 19th century is also described and placed in the context of his scientific and civic activities.

“There is an impressive amount of well-presented information in this book. … The chapters in this book are fully referenced and often give original text as well as translations of quotations. There are numerous illustrations, many excellent. The book will fit well in a specialist library and is a good monument to Secchi … .” (Peredur Williams, The Observatory, Vol. 141 (1284), October, 2021)

Ileana Chinnici is an astronomer at the INAF-Palermo Astronomical Observatory. Her field of research is the history of astronomy and she is the author of many publications in this field. In 1996-2004 she was curator of the astronomical museum of the Observatory and is presently in charge of its historical collections. Her interests are focused on the history of astronomy and astrophysics in the 19th century, especially exploiting archival resources. She is currently a member of the Organizing Committee of the Commission C3 (History of Astronomy) of the International Astronomical Union.Brother Guy Consolmagno SJ is Director of the Vatican Observatory. He is a native of Detroit, Michigan, received SM and SM degrees from MIT, and earned his PhD in Planetary Sciences from the University of Arizona in 1978. His scientific research explores the physical properties of meteorites and their connection with origin and evolution of asteroids and planets. Along with more than 200 scientific publications, he is the author of six popular astronomy books. In 2014 he received the Carl Sagan Medal from the American Astronomical Society Division for Planetary Sciences for excellence in public communication in planetary science.