  We describe our explicit Lorentz-invariant solution of the Einstein and null
geodesic equations for the deflection experiment of 2002 September 8 when a
massive moving body, Jupiter, passed within 3.7' of a line-of-sight to a
distant quasar. We develop a general relativistic framework which shows that
our measurement of the retarded position of a moving light-ray deflecting body
(Jupiter) by making use of the gravitational time delay of quasar's radio wave
is equivalent to comparison of the relativistic laws of the Lorentz
transformation for gravity and light. Because, according to Einstein, the
Lorentz transformation of gravity field variables must depend on a fundamental
speed $c$, its measurement through the retarded position of Jupiter in the
gravitational time delay allows us to study the causal nature of gravity and to
set an upper limit on the speed of propagation of gravity in the near zone of
the solar system as contrasted to the speed of the radio waves. We discuss the
misconceptions which have inhibited the acceptance of this interpretation of
the experiment. We also comment on other interpretations of this experiment by
Asada, Will, Samuel, Pascual-Sanchez, and Carlip and show that their `speed of
light' interpretations confuse the Lorentz transformation for gravity with that
for light, and the fundamental speed of gravity with the physical speed of
light from the quasar.
