There's a better solution that NTP (with some analog trick): 
http://en.wikipedia.org/wiki/Precision_Time_Protocol
It works on a properly configured multicast network with UDP packets,
for example on a private Wifi network, so no special hardware
is required.  Here's two free implementations for Linux:
http://ptpd.sourceforge.net/
http://linuxptp.sourceforge.net/
--
Marc

I wrote:
> NTP could be a good starting point, if drifting is further corrected
> with the help of some analog signal, like a sonic impulse or a bright
> flash.
> --
> Marc
> 
> Ross Bencina <[email protected]> a écrit :
> 
> > On 27/01/2013 9:55 PM, Michael Chapman wrote:
> > > But good point (I had browsed the DCF77 signal (Frankfurt clock)
> > > but wondered how to synch to it ... wondering if you would need
> > > NTP-style drift measurements and correction ... ; never thought of
> > > GPS ... durh!).
> > 
> > I don't think NTP is a good starting point.
> > 
> > Better to look at digital broadcast clock recovery.
> > 
> > Ross.
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> > 
> 
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