[time-nuts] Equinox and sidereal time

Antonio A. S. Magalhaes asmagal at fc.up.pt
Sun Mar 23 19:18:05 EDT 2014

Go to The Astronomical Almanac:


Antonio A.S. Magalhaes.

Em 2014-03-23 23:02, Neville Michie escreveu:
> Hi,
> can anyone out there point me to a source
> for the exact time of the equinoxes and solstices
> so that I can synchronise a sidereal clock?
> I assume that at some time the Universal Time we use
> is exactly the same as Sidereal time, and so a Sidereal clock
> could be set.
> I have a Tbolt producing 10MHz, and divide it with one of Tom's
> excellent PICDIV chips, to get sidereal seconds. I would like to
> be able to hear them ticking away as I follow a star with a 
> theodolite,
> and check my local time and position.
> If I use published times for the equinox, to one minute, I only get
> about 0.2 second resolution.
> There is probably more to this than meets the eye, but where does one
> find out about it?
> cheers,
> Neville Michie
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

More information about the time-nuts mailing list