[time-nuts] Sidereal time

[Bruce Griffiths]

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
>
That just gives the rate.
How are you going to set the actual Sidereal time to better than the 
0.9s that can be deduced from UTC?

Bruce