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Astronomical compendium lunar volvelle

Lunar volvelle for the astronomical compendium for latitude 48° North. Beneath this, a lunar volvelle, consisting of two brass discs, is set into the remaining body of the instrument. The outer disc has a lunar-age scale and an hour scale. The rotatable brass disc has a pointer, an hour scale and a circular aperture revealing a pictorial display of the phases of the moon.

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Object details

ID:	AST0415.4
Type:	Astronomical compendium lunar volvelle
Display location:	Not on display
Creator:	Unknown
Date made:	17th century
Credit:	National Maritime Museum, Greenwich, London, Caird Collection
Measurements:	Overall: 48 mm; Diameter: 44 mm
Parts:	Astronomical compendium Top of the astronomical compendium (AST0415.1) Astronomical compendium compass (AST0415.2) Astronomical compendium burning/magnifying glass (AST0415.3) Astronomical compendium lunar volvelle (AST0415.4) Astronomical compendium base (AST0415.5) Astronomical compendium base (AST0415.6)