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Callisto III e la Cometa di Halley: la ricerca di Johan Stein SJ tra leggenda e storia
Costantino Sigismondi
The Dutch Jesuit astronomer Johan Stein published in 1909 a text about the legend on a papal bull of Pope Callixtus III against the comet of 1456. This comet happened to be the Hal…
Ipotesi astronomiche sul foro della colonna augustea di Santa Maria in Aracoeli
Costantino Sigismondi
The third column of the left row in the Basilica of Santa Maria in Aracoeli in Rome, has a hole carved in it, of probable astronomical use. The tube aims at a point a 116 degrees o…
La meridiana di Egnazio Danti nella Torre dei Venti in Vaticano: un'icona della riforma Gregoriana del calendario
Costantino Sigismondi
The meridian line traced by Egnazio Danti in the Torre dei Venti in Vatican demostrated the need of the Gregorian Reformation of the Calendar. A review on this instrument is presen…
L'Astronomia del Venerdi' Santo e l'ora della Sindone
Costantino Sigismondi
The solar eclipse of Good Friday has always been recognized as a problem from the astronomical point of view. The date of Crucifixion has been investigated by many scholars and the…
Il Santo Sepolcro, orientamento astronomico della basilica e le omelie di san Cirillo di Gerusalemme
Costantino Sigismondi
On the spur of Calvary the Shroud appears. On this rock the Scriptures are fulfilled, and this rock, located exactly to the West of the Temple of Jerusalem, becomes mystically the…
Dungal Letterato E Astronomo. Note di stilistica e di astronomia sulla Lettera a Carlo Magno circa le eclissi di sole dell'810
Paolo Zanna, Costantino Sigismondi
Dúngal's letter to Charlemagne on the double solar eclipse in the year 810 is extremely interesting both for its form and for its subject matter. Part I of the present study deals…
Gerberto e l'Astronomia
Costantino Sigismondi
Gerbert of Aurillac was Pope Sylvester II form 999 to 1003. His history is presented in order to understand his outstanding contribution in the establishment of quadrivium sciences…
Gerberto e la Geografia Tolemaica
Costantino Sigismondi
The horologia are ancient ephemerides, tables of durations of the days and nights during all months of the year. The algorithms used to compute the horologia are here presented and…
Gerberto e le fistulae: tubi acustici ed astronomici
Costantino Sigismondi
Gerbert of Aurillac wrote to Constantine of Fleury in 978 a letter to describe in detail the procedure to point the star nearest to the North celestial pole. This was made to align…
Gerberto e la misura delle canne d'organo
Costantino Sigismondi
Gerbert of Aurillac in the Mensura Fistularum explained how to compute the length of organ pipes. The method is shown on two octaves, starting from a fistula of length L=16 units a…
Incontri celesti, vita del padre Clavio in cinque atti
Costantino Sigismondi
The year 2012 will be the fourth centennial year of the Jesuit Christopher Clavius (1535-1612), known as the Euclid of XVI century and the collaborator of the Pope Gregory XIII for…
L'Epistolario di Gerberto, papa astronomo
Costantino Sigismondi
A new Italian edition of the Letters of Gerbert, the astronomer, scientist and philosopher who become pope Silvester II, with their papal privileges has been published in the occas…