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This nocturnal watch ––horologium nocturnale– is an astronomical instrument used to measure the time through the observation of the Pole Star and the position of brigth stars in the celestial sphere.
This nocturnal is a reproduction of the one made in 1570 by Girolamo della Volpaia (currently at the Galileo Museum in Florence, former History of Science Museum). Because it was made before the Gregorian reform (1582) and its creador had not very accurate calculation boards, to use this instrument correctly one must add 38 days to observation date.
Max height (with stand): 16,5cm / Diameter: 14cm / Thickness: 3mm
Height: 6.50 inches / Diameter: 5.51 inches / Thickness: 0.12 inches