(34S) - Sunrise/Sunset

[Dieter]

(02-13-2015 02:19 PM)Jeff O. Wrote:  Your DST routine was easy to modify (assuming I did it correctly) to implement the DST rules followed in the US (and Canada

The code looks OK. The two XEQ 01 calls return the last Sunday in October resp. in February, adding 7 resp. 14 days gives the first (second) Sunday in November (March). Only the comment in the code needs an update:

Code:

228    #007           
229    IDIV           
230    RCLx L          Monday on or before 1 March resp. 1 November
231    DEC X           last Sunday of February resp. October
232    END

I would like to ask a final question: the accuracy for 2015 is astonishing. But what about other years? I assume the program uses constants that are optimized for a certain period. How well does the program perform for e.g. 2000, 2050 or 2100? What is the range of years the used constants were optimized for?

Dieter