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Eufrosino della Volpaia, Notturnale e quadrante orario
Eufrosino della Volpaia, Nocturnal and quadrant

Brass; diameter 10,4 cm, total length 18,7 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 3264

Instrument made of two disks of different diameter connected by an arm. The two faces of the larger disk served as a nocturnal on one side and a sundial on the other side. The faces of the smaller disk present two scales used to calculate the date of Easter and the annual motion of the Sun.