[time-nuts] Measuring sidereal/solar time? Re: A Leap Second is coming

Brooke Clarke brooke at pacific.net
Fri Dec 30 12:18:17 EST 2016

Hi Anders:

That's something I've thought about for decades using an optical system.  A few  years ago I looked at it again and 
found that astronomical "seeing" limits the accuracy.  So the accuracy achieved by a spaceborne "Stellar compass" will 
be much better than a ground based observation.  A radio based observation might work since the atmosphere would not be 
a factor.

Have Fun,

Brooke Clarke
The lesser of evils is still evil.

-------- Original Message --------
> out of curiosity, are there any amateur/semi-pro experiments that can
> measure the length of the solar or sidereal day to sub-millisecond
> resolution?
> To reproduce data like this:
> https://upload.wikimedia.org/wikipedia/commons/5/5b/Deviation_of_day_length_from_SI_day.svg
> Something in the sky that goes "ping" every day - detected with a pointing
> accuracy of < 1ms/24h or <0.01 arc-seconds (!?). Or perhaps two
> satellite-dishes pointed at the sun and noise-correlation/interferometry??
> Anders
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