EGNAZIO DANTI (attr.), Plane Astrolabe, c. 1570
Brass, wood; replica
Istituto e Museo di Storia della Scienza, inv. 3619

This instrument, used by Galileo after his return to Florence in 1610, exemplified mathematical astronomy. It is a refined calculation instrument that reproduces the aspect of the sky in the particular place of observation at any date or hour.