On Thursday 15 April 2010 13:35:13 Adam Kennedy wrote:
> And the next thing you know,
> incrementing by a day involves half a CPU second because you need to
> run a physical model of the orbit of the moon to work out if you are
> at a month boundary.

If you're trying to deal with that calendar, even that won't work since it is 
based on the physical sighting of the crescent after the new moon (if it's 
overcast at sundown, no new month for you). Even absent that you would have to 
have a latitude and longitude to figure out if the crescent was visible at 
sundown at the particular location.

I once suggested it might be more cost effective to arrange to paint the moon 
black so that calendar was no longer able to be used.
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