AXIOMS OF NEWTON'S EMISSION THEORY OF LIGHT

http://en.wikipedia.org/wiki/Emission_theory
"Emission theory (also called emitter theory or ballistic theory of light) was a competing theory for the special theory of relativity, explaining the results of the Michelson-Morley experiment. Emission theories obey the principle of relativity by having no preferred frame for light transmission, but say that light is emitted at speed "c" relative to its source instead of applying the invariance postulate. Thus, emitter theory combines electrodynamics and mechanics with a simple Newtonian theory. (...) In his Corpuscular theory Newton visualized light "corpuscles" being thrown off from hot bodies at a nominal speed of c with respect to the emitting object, and obeying the usual laws of Newtonian mechanics, and we then expect light to be moving towards us with a speed that is offset by the speed of the distant emitter (c ± v)."

So the null result of the Michelson-Morley experiment can be deduced from two axioms:

1. The principle of relativity is valid.

2. The speed of light (relative to the observer) varies with the speed of the light source, v, in accordance with the equation c'=c+v.

These are the axioms of Newton's emission theory of light relevant for inertial systems; if gravitation is involved, the generalized axioms a

1'. An inertial system floating in gravitation-free spece and a system falling in a uniform gravitational field are both mechanically and optically equivalent.

2'. (Galileo's principle) All mechanical objects fall with the same gravitational acceleration.

In the following video the variation of the speed of light in a gravitational field is deduced from Axiom 1' and Axiom 2':

http://www.youtube.com/watch?v=FJ2SVPahBzg
The light is perceived to be falling in a gravitational field just like a mechanical object would. (...) 07:56 : (c+dc)/c = 1+(g/c^2)dh

It is easy to show that, if Axiom 1' and Axiom 2' are true, Axiom 2 is true as well.

Pentcho Valev