Lo Gnomone Clementino Astronomia Meridiana in Basilica
  The Clementine Gnomon realized in 1702 by the astronomer Francesco Bianchini (1661-1729) upon the will of Pope Clement XI (1700-1721) in the Basilica of Santa Maria degli Angeli in Rome is fully reviewed about its scientific functions. 
Costantino Sigismondi
astro-ph.IM astro-ph.EP physics.hist-ph