http://www.einstein-online.info/spotlights/redshift_white_dwarfs Albert Einstein Institute: "One of the three classical tests for general relativity is the gravitational redshift of light or other forms of electromagnetic radiation. However, in contrast to the other two tests - the gravitational deflection of light and the relativistic perihelion shift -, you do not need general relativity to derive the correct prediction for the gravitational redshift. A combination of Newtonian gravity, a particle theory of light, and the weak equivalence principle (gravitating mass equals inertial mass) suffices. (...) The gravitational redshift was first measured on earth in 1960-65 by Pound, Rebka, and Snider at Harvard University..."
That is, one can assume that, in a gravitational field, light falls just as do ordinary objects (as predicted by Newton's emission theory of light), and deduce that the speed of light varies in accordance with the equation c'=c(1+gh/c^2). The frequency, as measured by the observer, varies proportionately, in accordance with the equation f'=f(1+gh/c^2). In 1960 Pound and Rebka proved, experimentally, the validity of the last equation.
Clearly the experiment has confirmed Newton's emission theory of light but Einsteinians teach that it has gloriously confirmed Divine Albert's Divine Theory. Why do Einsteinians do so? Because that's the way ahah ahah they like it, ahah ahah: