[time-nuts] Equinox and sidereal time

Neville Michie namichie at gmail.com
Sun Mar 23 19:02:24 EDT 2014

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?
Neville Michie

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