Interesting that the effect could be this large.
http://www.smh.com.au/technology/sci-tech/chilean-quake-shifted-earths-axis-nasa-scientist-20100302-peqe.html?autostart=1
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How would one go about verifying this? The angular difference after 1
year is about 3E-8 radians, which is probably well beyond the absolute
pointing accuracy of any telescope, and swamped by lunar tidal
deceleration anyway.
Henry
On Mon, Mar 1, 2010 at 7:36 PM, mc0fred mc0f...@gmail.com wrote:
3E-8 radians is 0.03 microradians. A microradian is about 5 arc-seconds,
so about 0.15 arc-seconds per year. I think that's in the range that could
be observed either optically or by VLBI.
-John
=
How would one go about verifying this? The angular difference after 1
year is about
Pretty trivial to do with GPS where a 1 ns error is under 1 foot of position
error (and a geodetic grade GPS can give sub-millimeter accuracy)... even a
cheap consumer grade unit is under 10 feet of error. 1.26 us of orbital
change is over 1100 feet of error.
One trick is to compare the
Of course... I am designing a GPS receiver as my day job and didn't
think of that ;)
Henry
On Mon, Mar 1, 2010 at 8:36 PM, Mark Sims hol...@hotmail.com wrote:
Pretty trivial to do with GPS where a 1 ns error is under 1 foot of position
error (and a geodetic grade GPS can give sub-millimeter
