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Stefano Buonsignori, Quadrante orario
Stefano Buonsignori, Horary quadrant

c. 1580
Brass, lignum vitae; radius 14,5 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 2499

The instrument carries on the recto a quadrant for Italic hours with markings for ante-meridian hours, with gold markings for ante-meridian hours and white markings for post-meridian hours. On the verso there are a zodiac circle, a lunar calendar and the chart of the planets.