Light's "direction" of travel, bending, and speed Hoping someone can clear up a few questions... At any particular instant in time (from anyone's perspective), is light (or a photon, if that helps) thought to have a specific direction of travel while between emission and absorption? I've read many thought experiments where this is implied, but also read that apart from the source and target nothing may be said about the nature of any path(s)... If yes to the above; is this direction of travel at c the "tangent" to the path when it is curved by either gravity or within an accelerating frame, or does c also include the lateral (radial) component comprising the curvature? If no to the first question; what prevents or distinguishes that the displacement curvature does not act on the light if its orientation direction of travel at that moment is radial to the gravitational source (or normal to the plane of acceleration)? If these questions are not clear or not well formed I'll try to answer any thoughts. Basically I'm trying to understand what it means if only light's lateral component is subject to curvature (and it's longitudinal component is not because that would be slowing below c?), and the relation between the two components to ensure observed c during curvature.