[time-nuts] Sidereal time

[Bob Camp]

Hi

Depending on exactly how the 59309 works, you might do better by chopping into it and feeding it with a micro that added an extra pulse every so often. That would allow you to stick some math in-between a UTC pps source and your clock. Let the micro go get all the magic numbers from USNO and keep everything "right".

Bob


On Jan 14, 2010, at 10:12 PM, 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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