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Girolamo della Volpaia, Nocturnal and horary quadrant


Girolamo della Volpaia (ca. 1530-1614)
Nocturnal and horary quadrant, 1568
Florence, Istituto e Museo di Storia della Scienza, inv. 2503

A portable instrument used to establish the hour both at night and during the day. It could also be used to determine what sign of the zodiac the Sun was in on any given day of the year.