Hi Bryan:
The first data on tectonic plate movement came from the Latitude Observatories. The Longitude problem was solved fairly
quickly by Harrison's clocks but the uncertainty of an observatories latitude because of wobble of the pole took much
longer and was addressed by a hand full of Latitude Observatories all at 39 deg 8 min North, and I'm lucky to have one
in my town.
http://www.prc68.com/I/UkiahObs.shtml
Note this is more like an extremely accurate surveying instrument than a telescope for star watching. We will be having
star parties since it's summer and the sky here is dark enough to see the Milky way.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
-------- Original Message --------
I have wondered how geologists are able to measure tectonic plate movements in the earths
surface to a couple cm's when the sensors from what I see/read they are nothing more than
sensors in concrete boxes?. I believe they use various technologies such as Very Long
Baseline
Interferometry<http://www.see.leeds.ac.uk/structure/dynamicearth/plates_move/active_tectonics/vlbi.htm>
(VLBI) and Satellite Laser
Ranging<http://www.see.leeds.ac.uk/structure/dynamicearth/plates_move/active_tectonics/slr1.htm>
(SLR)
All fascinating stuff....
-=Bryan=-
________________________________
From: time-nuts <time-nuts-boun...@febo.com> on behalf of Thorbjørn Pedersen
<thorbjorn.peder...@ikm.no>
Sent: June 19, 2017 9:42 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPS Antenna on Tower.
http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
[http://www.sp.se/sv/index/resources/GNSS/PublishingImages/pelare.jpg]<http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx>
GNSS-equipment - SP<http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx>
www.sp.se
GNSS-equipment RISE has equipment for GNSS (Global Navigation Satellite
Systems) for applications in Time and Frequency, Positioning and Atmospheric
Studies.
Have a look at the best receiving antenna I know about.
The tower must have cooling tubes coiled around it because of the sun heating
one side will make it bend away from the sun, and turn this way all day.
The cable and doom is also temperature controlled.
Best Regards
Thorbjørn W. Pedersen
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