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Jun10-10, 08:08 AM
DaveC426913's Avatar
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Quote Quote by rcgldr View Post
Regardless of the gravitational effect, frequency is a time related feature of a photon, and could be considered a photon's "clock".
Frequency is only applicable if there's a time element. A comb has a number of teeth per inch but that does not mean the teeth are experienced temporally. It is the observer is moving relative to the comb that engenders frequency (event per unit time) upon the comb.

This may seem like a spurious analogy but it's not; photons are not "moving through space in time"; photons are "fixed in spacetime".