Wp34s date from DOY

[Dieter]

(11-04-2015 04:33 PM)fhub Wrote:  This is one of the problems I don't really like, because you just need to put a long and complicated formula into a calculator program - simply boring.
And there's not much to 'optimize' apart from the usual tricks (using register arithmetics, complex registers etc.)

Easter programs for programmable calculators have a long tradition – exactly because they handle these long and complicated formulas. May I draw the gentlemen's attention for instance to this article: An Easter program for the HP29C.

In general, there are several ways of computing the Easter date. Gauss himself changed his formula several times. A good overview can be found in the respectice German wikipedia article. Please especially note the Lichtenberg formula at the end, as it directly includes two exceptions that else would have to be handled separately.

Dieter