Pioneer anomaly

Strip Newton down to the basics and he not only has altered the actual
way in why retrogrades are resolved,in jumping to a Sun based
observer,he has cut oof the ability to discriminate between Keplerian
motion but also the tiny exaggerated increasde in speed due to Roemer's
Equation of Light correction.

"PHÉNOMENON V.
Then the primary planets, by radii drawn to the earth, describe areas
no wise proportional to the times; but that the areas which they
describe by radii drawn to the sun are proportional to the times of
description.

For to the earth they appear sometimes direct, sometimes stationary,
nay, and sometimes retrograde. But from the sun they are always seen
direct, and to proceed with a motion nearly uniform, that is to say, a
little swifter in the perihelion and a little slower in the aphelion
distances, so as to maintain an equality in the description of the
areas. This a noted proposition among astronomers, and particularly
demonstrable in Jupiter, from the eclipses of his satellites; by the
help of which eclipses, as we have said, the heliocentric longitudes of
that planet, and its distances from the sun, are determined."

http://members.tripod.com/~gravitee/phaenomena.htm

It was NOT a noted proposition among astronomers who refered plotted
heliocentric trajectories against the annual orbital motion of the
Earth and not from a Sun based observer.Until that Newtonian
error,misguidedness or whatever you wish to call it is corrected you
can forget about physics,new or otherwise.