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Nocturnal And Sundial
Signed by Caspar Vopel
Dated 1557; Cologne
Brass; 130 mm in diameter

This instrument has the customary shape of a nocturnal, but in fact comprises several instruments. With one side the time can be discovered at night with a nocturnal, but some of the same scales are used in a volvelle for finding the age of the moon at any date. The other side has a Regiomontanus-type sundial for finding the time during the day.

A similar instrument is to be found in the British Museum, London (Epact 53179).

Museum of the History of Science, Oxford
Inventory number 33871

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Basic URL: http://www.mhs.ox.ac.uk/epact/catalogue.php?ENumber=97152

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