  Data from spacecrafts tracking exhibit many anomalies that suggest the
dependence of the speed of electromagnetic radiation with the motion of its
source. This dependence is different from that predicted from emission theories
that long ago have been demonstrated to be wrong. By relating the velocity of
light and the corresponding Doppler effect with the velocity of the source at
the time of detection, instead of the time of emission, it is possible to
explain quantitatively and qualitatively the spacecraft anomalies. Also, a
formulation of electromagnetism compatible with this conception is possible
(and also compatible with the known electromagnetic phenomena). Under this
theory the influence of the velocity of the source in the speed of light is
somewhat subtle in many practical situations and probably went unnoticed in
other phenomena.

Classical Physics