Throughout his military career, Malvasia maintained a strong general interest in astronomy, optics and scientific engineering. He is credited with having contributed to the invention of the reticle or "cross-hairs" during the 1620s; final credit is usually ascribed to Robert Hooke.[2]
In 1645 Malvasia invited Giovanni Domenico Cassini to Bologna and offered him a position in his observatory, which was close to completion. Most of their time was spent calculating newer, better, and more accurate ephemerides for astrological purposes using the rapidly advancing astronomical methods and tools of the day.[4] 17 years later, in 1662, their collaborative work, Ephemerides novissimae motuum coelestium, was published by Malvasia. It was dedicated to Cardinal Giulio Cesare Sacchetti - twice nominated by Antonio Barberini as the French candidate for pope[5] - and included a rather laudatory dedication in which Malvasia claimed he could trace Sacchetti's ancestry back to Ancient Roman gods.[6]
Malvasia corresponded with a number of other contemporary astronomers during his development of new methods.[7]
References and notes
^ abMalvasia's Life of the Caracci by Carlo Cesare Malvasia (conte) & Anne Summerscale (Reprint - Penn State Press, 2000)
^Note: Accounts of Malvasia's work include a description of an early reticle - silver strands crossed at right-angles to separated fields of view when looking through a telescope.
^Biographical Encyclopedia of Astronomers by Virginia Trimble, Thomas Williams, Katherine Bracher, Richard Jarrell, Jordan D. Marché and F. Jamil Ragep (Springer Reference, 20/11/2007)
^Rodolfo Calanca:Archived 2021-05-02 at the Wayback MachineL'astronomia nel ducato estense tra il XVII ed il XIX secolo (Astronomy in the duchy of Este between the seventeenth and the nineteenth century)