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Stephen Hawking, an Albert Einstein of our generation: Newton's theory
wrongly assumes that the speed of light is variable in a gravitational
field:

http://www.amazon.com/Brief-History-Time-Stephen-Hawking/dp/0553380168
Stephen Hawking, "A Brief History of Time", Chapter 6:
"Under the theory that light is made up of waves, it was not clear how
it would respond to gravity. But if light is composed of particles,
one might expect them to be affected by gravity in the same way that
cannonballs, rockets, and planets are.....In fact, it is not really
consistent to treat light like cannonballs in Newton's theory of
gravity because the speed of light is fixed. (A cannonball fired
upward from the earth will be slowed down by gravity and will
eventually stop and fall back; a photon, however, must continue upward
at a constant speed...)"

Lee Smolin, another Albert Einstein of our generation: Newton's theory
wrongly assumes that the speed of light is constant in a gravitational
field:

http://streamer.perimeterinstitute.ca/mediasite/viewer/?peid=5f32739a-624d-4ec8-9ecc-4d44d3d16fe9
Lee Smolin: "Newton's theory predicts that light goes in straight
lines and therefore if the star passes behind the sun, we can't see
it. Einstein's theory predicts that light is bent...."

The original Albert Einstein (Divine Albert): Newton's theory
correctly assumes that the speed of light is variable in a
gravitational field but gives the wrong equation. Divine Albert adopts
and even uses the wrong equation for some time but then gloriously
rejects it and discovers The True Equation:

http://www.speed-light.info/speed_of_light_variable.htm
"Einstein wrote this paper in 1911 in German (download from:
http://www.physik.uni-augsburg.de/annalen/history/einstein-papers/1911_35_898-908.pdf).
It predated the full formal development of general relativity by about
four years. You can find an English translation of this paper in the
Dover book 'The Principle of Relativity' beginning on page 99; you
will find in section 3 of that paper Einstein's derivation of the
variable speed of light in a gravitational potential, eqn (3). The
result is: c'=c0(1+phi/c^2) where phi is the gravitational potential
relative to the point where the speed of light co is measured......You
can find a more sophisticated derivation later by Einstein (1955) from
the full theory of general relativity in the weak field
approximation....For the 1955 results but not in coordinates see page
93, eqn (6.28): c(r)=[1+2phi(r)/c^2]c. Namely the 1955 approximation
shows a variation in km/sec twice as much as first predicted in 1911."

The scientific community agrees with any Einstein and fiercely sings
"Yes we all believe in relativity, relativity, relativity" and "Divine
Einstein":

http://www.youtube.com/watch?v=5PkLLXhONvQ

http://www.haverford.edu/physics/songs/divineEinstein.pdf

http://www.everythingimportant.org/Einstein_worship/

Pentcho Valev
pvalev@yahoo.com