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I am a bit confused about reference frames and inertial frames.

According to the first postulate of special relativity (if I'm right), all physical laws take their simplest form in an inertial frame,

*and there exist multiple inertial frames interrelated by uniform translation*.

Now if I imagine an inertial frame, from which I watch a photon -- according to the special theory of relativity -- I measure the velocity of this photon to be

*c*. Let's call this Frame

*K*.

The postulate says: "

*there exist multiple inertial frames interrelated by uniform translation*". If a translation of velocity

*c*is a uniform one, then a frame of reference fixed to the photon would be an inertial frame as well. Let's call this Frame

*K'*

Here comes the dilemma which confuses me:

In the Inertial Frame

*K*the photon's velocity is

*c*, like in any Inertial Frame. But how could the velocity of a photon be the same value,

*c*, in

*K'*, which is in fact fixed to it?

I can think of only one resolution of my dilemma:

There's no sense of it, if we state, that

*any reference frame, which has a constant velocity viewing it from an inertial frame, is an inertial frame itself,*

__except in the case when it is moving with the velocity of light__, viewing it from an inertial frame.But by stating this (at least, for me it seams) we make the whole theory inexact.

I think it is only a misunderstanding of the theory from my side...

Any help would be appreciated.

Regards