Tag Archives: Astronomy History

Specola Guestbook: Oct 21, 1910 – Guido Horn d’Arturo

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This entry is part 19 of 19 in the series Specola Guestbook

Since its founding in 1891, many people have passed through the doors of the Vatican Observatory.  A quick perusal of our guestbook reveals several Names, including Popes, nobel laureates, astronauts, actors, and saints. Today’s guestbook entry is from October 21, 1910, when Guido Horn made a visit. Next to his name, Guido Horn d’Arturo (1879-1967) wrote, “R. osservatorio astronomico di Torino” (Royal astronomical observatory of Turin). He was an astronomer who in 1921 would become the director of the Bologna observatory. Born in Trieste, he studied in Vienna and then worked at observatories in Trieste, Catania, Turin (where he was at the time of his visit to the Specola) and the Roman College, before ending up in Bologna. During World War I (i.e. after his visit to the Specola), Guido Horn added d’Arturo to his name to Italianize it. He served in the Italian army, though his native Trieste was part of the Austro-Hungarian empire at that time.  At the … Continue reading →

Specola Guestbook: July 11, 1910 – Anne Sewell Young

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This entry is part 17 of 19 in the series Specola Guestbook

Since its founding in 1891, many people have passed through the doors of the Vatican Observatory.  A quick perusal of our guestbook reveals several Names, including Popes, nobel laureates, astronauts, actors, and saints. Today’s guestbook entry is from July 11, 1910, when Anne Sewell Young made a visit. Next to her name, Anne Sewell Young (1871-1961) wrote, “John Payson Williston Observatory, South Hadley, Mass.” After finishing an M.S. at Carleton College, Young came to Mount Holyoke College in 1898 where she became director of the John Payson Williston Observatory. Meanwhile, she completed her Ph.D. from Columbia University in 1906. Her astronomical research involved many fields: her Ph.D. was a survey of stars in the constellation Perseus. She also supervised research on sunspots and a student expedition to observe a solar eclipse in 1925. Her primary interest was variable stars. She was a founding member of the American Association of Variable Star Observers and became its president in 1923.   … Continue reading →

Religious Scientists: Fr. Francesco Grimaldi S.J. (1618-1663), Optics of Diffraction

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This entry is part 8 of 8 in the series Religious Scientists of the Catholic Church

Today I present yet another Jesuit physicist/astronomer: Francesco Maria Grimaldi.  He made a number of contributions in physics and astronomy, many of which in collaboration with another Jesuit: Fr. Giovanni Battista Riccioli S.J. (1598-1671). I will deal with Riccioli in a future post. However, Grimaldi can take full credit for pioneering the study of diffraction of light, and in coining the term, “diffraction.” Biographical Sketch:   Grimaldi was born in Bologna in 1618. His father, a wealthy silk merchant, died when Francesco was still very young. In 1632 (at age 14) he entered the Jesuit order with his brother Vincenzo.  After two years as a novice, he studied rhetoric for a year in Novellara. In 1635 he traveled to Parma for philosophy studies at the college of S. Rocco, but after only one year transferred to Ferrara to begin studying physics. He returned to Bologna to finish his philosophy studies. In 1638 he he was missioned to be professor at … Continue reading →

Specola Guestbook: January 5, 1910 – Vincenzo Cerulli and Giorgio Abetti

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This entry is part 8 of 19 in the series Specola Guestbook

Since its founding in 1891, many people have passed through the doors of the Vatican Observatory.  A quick perusal of our guestbook reveals several Names, including Popes, nobel laureates, astronauts, actors, and saints. Today’s guestbook entry is from January 5, 1910, when Vincenzo Cerulli and Giorgio Abetti made a visit. Next to his name, Vincenzo Cerulli (1859-1927) wrote “di Collurania.” He was the founder and director of the Collurania-Teramo Observatory, located in Teramo, Italy.  With the 40-cm refractor installed there, he made observations of the planet Mars, and concluded that the “canali” were optical illusions.  He discovered the asteroid (704) Interamnia. The Martian crater Cerulli is named after him, as are the asteroids (366) Vincentia and (31028) Cerulli. Next to his name, Giorgio Abetti (1882-1982) wrote “Istituto di Fisica Terrestre della R. Università – Napoli” (Institute of Terrestrial Physics of the Royal University of Naples).  He made many later visits, most of which were signed with the affiliation Collegio Romano, … Continue reading →

Religious Scientists: Fr. Giuseppe Piazzi C.R. (1746-1826), Discoverer of the First Asteroid

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This entry is part 5 of 8 in the series Religious Scientists of the Catholic Church

Today, just under 800,000 asteroids and Trans Neptunian Objects are known and catalogued by the Minor Planet Center of the Smithsonian Astrophysical Observatory, with more being discovered every day.  However, before 1800 the existence of this entire class of objects was entirely unknown. The first asteroid, which today we know as (1) Ceres, was discovered by an astronomer who was also a priest: Fr. Giuseppe Piazzi C.R. Biographical Sketch Giuseppe Piazzi was born July 16, 1746 in Ponte in Valtellina, Italy.  He entered the Theatine order in 1765, and was ordained a priest in 1769.  While he taught philosophy, theology, and mathematics at various stages of his early life in the order, he also had an interest in astronomy. He came to Palermo in 1781 as a lecturer in mathematics at the Accademia dei Regi Studi. In 1787, he became professor of astronomy. King Ferdinand of Sicily named him to be the first director of the Palermo Astronomical Observatory. He obtained … Continue reading →

Specola Guestbook: June 5, 1909 – George Ellery Hale

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This entry is part 6 of 19 in the series Specola Guestbook

Since its founding in 1891, many people have passed through the doors of the Vatican Observatory.  A quick perusal of our guestbook reveals several Names, including Popes, nobel laureates, astronauts, actors, and saints. Today’s guestbook entry is from June 5, 1909, when George E. Hale made a visit. Next to his name, George Ellery Hale (1868-1938) wrote “Mt. Wilson Solar Observatory, California.” The year prior to his visit, he used the Zeeman effect–(see the previous post on H. A. Lorentz)–to discover magnetic fields in sunspots. He also found that, between sunspot cycles, the magnetic polarity of fields through sunspots in northern vs southern hemisphere switches orientation – what is today known as Hale’s Law (or the Hale-Nicholson Law). In 1913, Hale advised Albert Einstein of the possibility of observing the effects of general relativity on starlight passing near the Sun, which he suggested might be possible during a total solar eclipse.  This led to the eclipse observing expeditions of Arthur … Continue reading →

Specola Guestbook: January 15, 1909 – Herbert H. Turner

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This entry is part 5 of 19 in the series Specola Guestbook

Since its founding in 1891, many people have passed through the doors of the Vatican Observatory.  A quick perusal of our guestbook reveals several Names, including Popes, nobel laureates, astronauts, actors, and saints. Today’s guestbook entry is from January 15, 1909, when Herbert H. Turner made a visit. Next to his name, Herbert Hall Turner F.R.S. (1861-1930) wrote “University Observatory, Oxford.” H. H. Turner visited the Vatican Observatory more than once. He also signed our book on May 12, 1910 and during the first IAU General Assembly on May 9, 1922. Director of the Radcliffe Observatory at Oxford University, he was an astronomer and a seismologist. In seismology, he discovered deep-focus earthquakes (more than 300 km deep), which occur in subduction zones. In astronomy, he coined the word “parsec.” (A parsec is a unit of distance for a star subtending 1 arcsecond of parallax shift due to 1AU of motion from the observer, or 3.26 light-years.  The term became the … Continue reading →