• diameter: 9,5 cm,
  
  
• made of solid brass
  
  
• hardwood display stand included
  
  
• instrument  is fully functional
  
  
• information booklet included
  
  
• elegant box included
  

Only perpetual calendars meet the basic condition to permit the deduction of any essential data from any other data (year, month, week and day). However, all the analog perpetual calendars known are hardly perpetual since the limit of their calculations is about 50 years.

Our calendar starts at January 1, 1600, and ends at December 31, 2799. 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".

Customer Reviews:

Sherry Whitten,  USA
Rating:
My husband ordered the Perpetual Calendar for my birthday. Unlike other perpetual calendars on the market, this one offers a broad range of dates - from the year 1600 to 2799. (Several others on the market only offer a 50 year window.) In addition to its functionality, it looks beautiful on my desk - truly an elegant piece. The service and follow up from
pocketsundials.com was excellent. I highly recommend both the item and the web site.