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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. This calendar starts at 1 January 1600 and ends at 31 December 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".
Delivery in a presentation box with a user manual in 4 languages (English, French, Italian, Spanish).