The EOT code that I linked to (http://www.astronomycorner.net/games/analemma.c)
and am using is interesting because it appears to be applicable to other
planets. It has parameters like the orbit
obliquity/eccentricity/perihelion/year length that can be changed. It also
does not make assumptions like the time of perihelion is 12 days past a fixed
value of the winter equinox (i.e. Jan 2).
A clock routine that I wrote for the ATMEGA2561/ATMEGA128 runs off of a 10Khz
interrupt. It does a first-order compensation for crystal drift by
occasionally ignoring or duplicating timer tick processing. It can produce
very good long-lerm clock performance.
I also have had very good results using the DS3231 temperature compensated
clock chip. My alarm clock uses a Trimble Res-T GPS backed up by the DS3231...
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I've got the Arduino code running that does the EOT
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