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calculations and to refer to specific years in chronicles along with
other dating techniques.

The cycle of correspondences between vruceletos and the days of the
week is repeated every 28 years, a period also used in old Russian
chronology as "solar cycle". The count of solar cycles in this
calendar system starts from March 1, 5508 BCE (called Constantinople
World Aera).

I.A.Klimishin in his book "Calendar and Chronology" (Moscow, Nauka,
1985, pp. 66-70) gives the following formulae to calculate solar
cycles and vruceletos ([] meaning the integer part of the quotient and
|| the remainder):

- First get the solar cycle (Q) of the year of Constantinople aera (B):

    Q = |B/28|

or Christian aera (R):

    Q = |(R-8)/28|