Re: Concalendrical reference point

John Cowan
> The point here is that the Julian calendar
> repeats itself every 28 years, the moon phases every 19 years (19 years
> = 255 lunar months almost exactly), and the Roman Imperial taxes
> repeated every 15 years.  4173 B.C.E. is the moment when all three
> of these cycles are in the first year.  So Jan 1, 4173 B.C.E. is a
> Sunday and a full moon and the first year of the indiction (tax) cycle.
Does this mean that if we factor out the culture-specific Roman
tax calendar, leaving us with just solar and lunar cycles, that
a combined solar and lunar cycle is 28 * 19 = 532 years?

Is it possible to work out dates in the past when, say, the spring
equinox and the corresponding lunar phase (I don't know what it's
called, but will enjoy someone taking pleasure in informing me)
happen on the same day at notionally the exact same moment? The
idea is that this would serve to locate the boundaries between
the 532-year cycles.

--And.

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