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

Brooke Clarke brooke at pacific.net
Fri Dec 30 15:07:40 EST 2016


Maybe this could be done with GPS or higher frequencies so the angular resolution would be better?

Have Fun,

Brooke Clarke
The lesser of evils is still evil.

-------- Original Message --------
> Brooke,
> The problem in radio ground observation can be resolution accuracy, but there's also a good transmission into far 
> infrared wavelengths, which could require smaller dishes to get stellar images. The problem of far IR is the cost of 
> right filters/sensor, which are a bit difficult to find.
> Radio objects, on the other hand, can be solved using an interferometer: LOFAR interferometers work at frequencies 
> higher than 10MHz, frequencies totally transparent to the atmosphere and easily computable even by consumer PCs. There 
> is some work done with common PCs using two RTL-SDR dongles and two satellite dishes.
> see http://www.sbrac.org/files/DTP_RX.pdf
> Best Regards,
> Ilia.
> On 12/30/16 17:18, Brooke Clarke wrote:
>> 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.
>> http://www.prc68.com/I/StellarTime.shtml

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