The lunisolar Eurasian Calendars were developed by Kaldarhan Kandar. The basic one uses a leap cycle of 464 years, the other spans 8 of these cycles for a total of 3712 years, which is the smallest common multiple with the 128-year tropical cycle.

The 464 years group into 25 sub-cycles. The middle one thereof spans 8 years and all others 19 years. The full cycle of 3712 years is also split into 189 sub-cycles of 19 years and 11 truncated sub-cycles of just 11 years each. The 2nd, 5th, 7th, 10th, 13th, 15th and 18th year of any sub-cycle contains a leap month.

The epoch is Friday 1 January 325 (Julian, i.e. 0325-01-02 proleptic Gregorian) in the year the Council of Nicea took place, although other dates have also been considered:

  • 1 January 45 BC
  • Wednesday 1 January 2014
  • Sunday 1 January 271
  • Friday 29 August 284 (Diocletian epoch)

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