Epact Scientific Instruments of Medieval and Renaissance Europe

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Nocturnal And Sundial
Signed by Antonius Geminus
Dated 1589; Rome
Brass; 110 mm in diameter

This instrument tells the time by day or night anywhere in the world. The combination for this purpose of a nocturnal and an unusual type of altitude sundial is the same as that on the instrument made in Antwerp by Michiel Coignet at a similar period.

These Italian and Flemish instruments can be linked with practical mathematics in France, as the standard account of the dial was published by Oronce Fine of Paris.

Museum of the History of Science, Oxford
Inventory number 42143

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