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. Malvasia was elected a
Senator of
Bologna and began construction of the privately owned
Panzano Observatory in the early 1640s. 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. 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 - and included a rather laudatory dedication in which Malvasia claimed he could trace Sacchetti's ancestry back to
Ancient Roman gods. Malvasia corresponded with a number of other contemporary astronomers during his development of new methods. ==Works==