The astrolabe was the main instrument in Islamic astronomy. A plane representation of the celestial sphere, it is composed of one or more disks engraved with the grid of meridians and parallels, and a rotating “rete” showing the positions of the fixed stars.
Tomba-Koelliker plane astrolabe
Canonical hours clock
Dante historiato - The Earthly Paradise: the chariot drawn by the gryphon. Appearance of Beatrice