Perpetual calendar

This calendar start at Junuary 1, 1600, and ends at December 31, 1799.
It is based on a repeating cycle of 400 years and a solar cycle of 28 years.
It works by means of the "Dominical letter".

You can find out on the day of the week of any event of which we know only the date and the year.
Or, you may get dates, knowing the day (eg Sunday), month and year.

Materials: brass and wood base

Diameter: 90mm

Thickness: 15mm

Other characteristics:
detailed description of the functioning,
brief history of the instrument,
supplied with gift packaging.