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martillo
19th April 2007 - 01:44 AM
Gravity Probe B results seem strange, every moon and planet are proper gyroscopes (better than Gravity Probe B ones since they are not suspended by any electric field) ever rotating around their axis and orbiting around a much more massive object in the space but never was presented any evidence about the "geodetic" and "frame dragging" effects on them!!!
manco
19th April 2007 - 05:48 PM
QUOTE (martillo+Apr 19 2007, 01:44 AM)
Gravity Probe B results seem strange, every moon and planet are proper gyroscopes (better than Gravity Probe B ones since they are not suspended by any electric field) ever rotating around their axis and orbiting around a much more massive object in the space but never was presented any evidence about the "geodetic" and "frame dragging" effects on them!!!

Wrong,

In 1916, W. de Sitter predicted a minute relativistic correction to the complicated motions of the Earth-Moon system around the Sun -- an effect finally detected in 1988 through an elaborate combination of lunar ranging and radio interferometry data.
turin
20th April 2007 - 03:02 AM
Also, don't forget that GPB is orbiting in a polar orbit to maximize the effect, unlike the natural gyroscopes which tend to orbit near the equitorial plane of their parent.
martillo
20th April 2007 - 12:47 PM
But I'm thinking in the antique constructions of thousands of years made to be aligned with the Sun and the moon. There would be thousands of years of shift in the axis orientation of Earth and they would not be aligned anymore at present days...
LearmSceince
20th April 2007 - 10:24 PM
QUOTE (martillo+Apr 20 2007, 12:47 PM)
But I'm thinking in the antique constructions of thousands of years made to be aligned with the Sun and the moon. There would be thousands of years of shift in the axis orientation of Earth and they would not be aligned anymore at present days...

They are not.

You can tell when each Egyptian pyramid was built by seeing how it is (mis)aligned with true north. It was built when north was that way it faces!
martillo
26th April 2007 - 11:11 AM
I have now realized that the effects are NEGLIHIBLE. Looking at the equation presented in the second picture of the Standford's page: GPB status the distance from Earth to the Sun is so huge that both effects (the geodetic and the frame dragging) are too small to be detected.

So I apologize for creating this thread.
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