Re: Weakness in the results of the three tests of GR shown in rhe lasr century,.

On Thu, 31 Oct 2024 1:12:01 +0000, ProkaryoticCaspaseHomolog wrote:

...and their displacements due to stellar aberration. The precision of
Hipparcos's measurements were such that stars even a fraction of a
degree different in declination would follow measurably different
Bradley ellipses (or rather, overlapping Bradley ellipses from the
spacecraft's orbit around the Sun and its orbit around the Earth.)

The field of view of the Hipparcos telescope is about 0.9 degrees.
At the poles, the Bradley ellipse of a star from the orbit of Earth
around the Sun is a circle of radius 20" while at the equator, it is
a straight back and forth line. So you can handwave guesstimate that
there might be approximately 0.1" difference in semi-minor axis of
the Bradley ellipse of stars at the center versus the edge of the
Hipparcos telescope's field of view resulting from the Earth's orbit
around the Sun, depending on the direction that it is pointing.
Hipparcos never reached its originally intended geostationary orbit,
so the Bradley "ellipse" from its orbit around the Earth is sort of
wierdly shaped, with sections corresponding to a semi-major axis of
0.6" (at apogee) to 2.5" (at perigee). Differential aberration from
this source would be superimposed on the differential center-to-edge
aberration from Earth's orbit around the Sun.