04-01-2004, 11:12 PM
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calendars of 6 year intervals; calendar of trees
In article ,
(Archimedes Plutonium) wrote:
I collect pretty calendars and knew that one year I could revisit an
old calendar and hang it up to use for that new year. I had to wait 6
years because now I am re-using a 1998 calendar for year 2004. So that
I can basicly recycle my old calendars and have a stock of 6 calendars
to cover every future year....
You need 14, not 6. A year may begin on any day of the week (7
possibilities), and it may be either a leap year or not (2
possibilities), giving 14 possible year-patterns altogether. This
ignores holidays such as Easter.
The cycle of recurring year-patterns goes 6, 11, 11, 28.
What I mean, for example, is that
your 1993 calendar could be re-used in 1993 + 6 = 1999,
your 1994 calendar could be re-used in 1994 + 11 = 2005,
your 1995 calendar could be re-used in 1995 + 11 = 2006,
your 1996 calendar could be re-used in 1996 + 28 = 2024.
Like you, I keep old calendars. This "6, 11, 11, 28" rule shows
when I can re-use the nicer ones. Since 1998 was two years after a leap
year, your 1998 calendar can't actually be re-used this year, but rather
in 1998 + 11 = 2009.
Ken Pledger.
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