[time-nuts] Chinese NTP Time server

[Gregory Beat]

Kevin -

Welcome to spherical geometry.  
Take a globe of the earth and a ball of string or yarn ... 
and you can create the physical re-creation to “see” how the hole is created.
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The American GPS constellation consists of 24 satellites in 6 orbital planes with an orbital inclination of 55 degrees (20,180 km or 12,540 miles), MEO (Medium Earth Orbit).  This would create the ~30° “hole” that you observe on the Lady Heather plots from your location.
Glonass (Russian) constellation uses a 64° inclination.

Satellite constellations (Wikipedia)
https://en.wikipedia.org/wiki/Satellite_constellation

greg
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Date: Mon, 30 Dec 2019 11:02:22 -0800
From: Kevin Rowett <kevin at rowett.org>
To: <time-nuts at lists.febo.com>
Subject: Re: [time-nuts] Chinese NTP Time server

I’ve looked at plots posted from many places in NA.  
They all show the same characteristic.  A large hole of coverage +-30 of north.

I have mine connected to a very good antenna, with a clear view of the sky, and experience the same lack of coverage.  I had at first attributed it to poor antenna coverage, tried several antenna, then started looking online, and found others showed the same lack of coverage.

The quest goes on.
KR
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Looking at the Sat plot in the lower right of the screen shot (sat position versus SS), what causes, or contributes to the shading +-30 degrees?

Thanks.
KR