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If your "mean" translates into the Yankee "tightwad", then in fact one can 
simply buy a perpetual almanac, of the abbreviated type found in the back of 
Hewitt Schlereth's books on navigation and others. They include 4 sets of 
data, plus the recurring years (198x, 199x, 199y, etc.) for which eash 
particular set should be used, plus one offset correction to be added to each 
set for each four-year cycle. Considering the physical amount of space they 
can avoid consuming, these permanent almanacs were logical for small craft. I 
say "were" because of course with modern electronics in the past 15 years, 
there are even smaller ways to carry better data.

The change to the Gregorian Calendar (the conventional western AD calendar) 
reflects, what, something like a ten-day shift that Pope Gregory decreed in 
order to make the paper calendar line up with an astronomical one (a sun 
calendar) that he'd noticed was that far out of alignment after what, 
1300-odd? years.

   

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