At some point, the Gregorian calendar would add or subtract a February 29th out of the standard scheme in order to keep the calendar in sync with the seasons. It's a bit more interesting to contemplate what change should be made to the Jewish calendar in order to keep the seasons in sync. Two months have leap days and there is a leap month, so there are lots of possibilities, but not all combinations are allowed in any given year due to restrictions on the day of week. I suppose another possibility is to just adjust the orbit of the earth, although one of the calendars would still have to be adjusted since their average year lengths are different. --ms On 22-Nov-13 23:32, Henry Baker wrote:

Cute discussion about the collisions of various calendars over the next 10's of thousands of years;

http://www.slate.com/articles/life/explainer/2013/11/thanksgivukkah_when_wil...

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