*Hemisferium Perpetual Calendar Brass Pin H110

The Perpetual Calendar can find any date, day of the week and month from January 1, 1600 to December 31, 2799 including the bissextile years also known as leap years. The original piece on which this miniature replica is designed was made in France between 1650 and 1700 and is kept at the National Maritime Museum in London. The calendar consists of three rotatable discs set on top of the main disc with a date scale and a lunar age scale among other features that can be adjusted using the instructions to work out what day it was or will be at some point in the future. This vertical sun disk has two faces. The one of the high clock and the one depicted, a perpetual calendar. Non-functional object. Measurements: Diameter: 25mm / Thickness: 1.8mm