"John Schutkeker" wrote in message
. 17.102...
"Randall Coleman" wrote in
news:np34h.695$L35.633@trnddc02:


wrote

... not quite the same vocabulary, but I work for a company that
works on a 13 period accounting calendar. So we recieve 13 pay
cheques a year, one every 4 weeks. However, every seven years we have
a 53 week year, whereby one of 'periods' is 5 weeks instead of four
...

a similar mechanism for the same problem

Thanks for that input. I haven't found a calendar system that makes
an adjustment every seven years, but your post verifies that that can
work.

You posted to the wrong group. If you'd posted to sci.astro, you would
have had more expert answers than you could answer. They're talking
about our calendar. There is no system that adjusts the calendar every
seven years.

Until I read the first response, I thought that there were always 13
months in a year. If there are 12 and a fraction months in one, then
every few years that fraction will align just right so that the year
both begins and ends with a new moon (or a full one, if you prefer).
Then there are 13 "moons" in a year.

If the first responder's numbers are accurate, that number is not 7. He
quoted 12.38 months per year, which means that it would happen every
three years, with a further correction for the gradual accumulation of
the renmaining 0.05. Thus, ever twenty years, you would have a thirteen
month year every two years.

I suspect that the number 7 is taken from the number of days in the
week, although I can't quite put my finger on what they were trying to
conjure up.

Thanks for the suggestion. I posted my question at sci.astro. Let's see if
I get any results.

Randall Coleman