Brian,
Last I looked, the solar/sidereal ratio was in fact 1:1.00273790935
though that was a while back. I build "precision" pendulum clocks and
in designing a clock that would beat seconds and tell mean time as well
as sidereal time I used a gear train of 15/47x49/97x82/31/x87/37 as I
remember, which gave me an error of approximately .0073 secs/year
sidereal. I know it's a bit arcane for this group, but the accuracy
isn't bad! Doing the equation of time is mechanically a bigger pia...
Bill S
Brian Kirby wrote:
I would like to have an electronic clock to keep sidereal time. I am
planning on using a HP 59309A, which can except an external clock of
1/5/10 Mhz.
According to Wikipedia sidereal time is 23 hours 56 minutes and 4.091
seconds - a total of 86,164.091 seconds
So 86,400 seconds for a normal "atomic defined" day divided by
86,164.091 = 1.002,737,903,89
If I set the 59309A to 10 Mhz external clock and dial a synthesizer up
to 10.0273790, the unit should be able to keep sidereal time.
Is my math and theory correct ?
Brian - KD4FM
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