The 59309A is a GPIB interfaced clock unit and can be set to a specific time via the GPIB interface. It also puts out the time and date via the GPIB.
So it can be set to a specific siderial time from an external UTC clock w/ the appropriate SW to compute Siderial Time from UTC. -John =================== > It is an interesting question, we are so used to WWV and GPS with > regular time signals to synchronise clocks to mean solar time. > One method is to get a pocket calculator to identify a time in the > future when a siderial second nearly corresponds to a UTC second > and use the PPS pulse from GPS to jam a preset time into the Siderial > clock, (or start a halted clock with the correct time preset. > How long you have to wait for corresponding seconds depends on how > accurate you want it. > cheers, Neville Michie > > > > On 15/01/2010, at 2:25 PM, Bruce Griffiths wrote: > >> 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 >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ >> time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.