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

2016-12-30 Thread David
To improve the accuracy, I would integrate several measurements. There is no reason a sampled measurement at only one time needs to be made. On Fri, 30 Dec 2016 09:18:17 -0800, you wrote: >Hi Anders: > >That's something I've thought about for decades using an optical system. A >few years ago

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

2016-12-30 Thread Brooke Clarke
Hi: Maybe this could be done with GPS or higher frequencies so the angular resolution would be better? -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html The lesser of evils is still evil. Original Message Brooke, The

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

2016-12-30 Thread jimlux
On 12/30/16 9:53 AM, Ilia Platone wrote: 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

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

2016-12-30 Thread Ilia Platone
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

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

2016-12-30 Thread Brooke Clarke
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.

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

2016-12-30 Thread Jim Palfreyman
I don't think we could call it "amateur/semi-pro" but the millisecond pulsar J0437-4715 would be perfect for this. Bright and precise. Only for southern hemisphere people though. :-) Jim Palfreyman On 30 December 2016 at 19:59, Anders Wallin wrote: > out of

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

2016-12-30 Thread Anders Wallin
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