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My friend is moving in my inertial frame and receives light in the two directions parallel to her movement: from behind and from ahead. The photons that reach her travel at c in my frame, so I presume they will approach my friend at different speeds (as I view it): faster from ahead and slower from behind. But we know from SR that my friend would measure all photons to be moving at speed c. Explain (away) the seeming contradiction so that the photons coming from behind and in front both measure at c on board her frame.