No such thing as a siderial second.
Le 15/01/2010 05:04, Neville Michie a écrit :
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
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