  The Gravity Probe B (GP-B) Experiment of NASA was aimed to test the
theoretical predictions of Einstein's 1916 relativistic tensor theory of
gravity in curved space-time (General Relativity (GR)) concerning the spin axis
precession of a gyroscope moving in the field of a slowly rotating massive
body, like the Earth. In 2011, GP-B mission reported its measured data on the
precession (displacement) angles of the spin axes of the four spherical
gyroscopes housed in a satellite orbiting 642 km (400 mi) above the Earth in
polar orbit. The reported results are in agreement with the predictions of GR.
For the first time, here we report an undergraduate level explanation of the
GP-B experimental results using Heaviside-Maxwellian (vector) Gravity (HMG) in
flat space-time, first formulated by Heaviside in 1893, and later
considered/re-discovered by many authors. Our new explanation of the GP-B
results provides a new test of HMG apart from the existing ones, which deserves
the attention of researchers in the field for its simplicity and new
perspective.
