A. I am constructing a theoretical midpoint that is invariant, that is all. Any two wave fronts, wherever located and unrelated to the technical or reasonable ability to measure the situation have a midpoint that is invariant. If the concept is new to you, well then join the club, becaue it is new to me also, but coneptually and physically the description should hold. Do you see a flaw? Applying the description to our hypotheticals is reasonable. Look at my links again , I make much of this in cocnstructing the method for determining whether the photons were emtited simultaneosly.
B. If I understand you yes. The midpoint can be of the type we have been discussing in our hypotheticals, or on the grander scale of simultaneously or even nonsimultaneously errupting supernovae. Liike I mentioned, an expanding wave front chugging along for a million years has a huge number of midpoints between itself and all the other wave fronts in the universe. When a new pulse (photon) comes along, for any reason, another midpoint between the new wave front and the ancient is established.
C. In the hypotheticals we have been discussing, the midpoint is everything. For instance I argued in a previous thread to someone claiming one of the lights had to be pulsed on earlier than the other that he could be correct up to a point. Without any information locating a source, then the wave front is all that matters and that wave fronts could have been pulsed on at any time. I have not expressly used the used the term 'absolute space' in any argument that I recall, and only offered the concept here that under the conditions that the construct of the 'midpoint system' is an effective absolute space, then if SR denies the concept of absolute space SR would would be defective for that reson, right? You and I are debating an issue. You make a statement, any statement, denying the physical reality of 'absolute space'. I take this as meaning you are jusifying SR or something of which I am completely ignorant, but at least I was able to blunt the claim of any making the habitual claim of the lack of an ' absolute sapce' . OK I may have been in the dark, but so what? If one of an infinite number of inebriated Peruvian llamas suddenly handed us a single piece of paper with all the issues laid to rest with all the ambiguities, would you deny using the llama paper, just because it came from a llama?, an inebriated llama at that? or would the truth of the matter be sufficient?
D. Without some information other than the detection of the photons all the observer can determine is the point of collision, that we have been referring to as the "midpoint", can only be determined with certainty as the midpoint of the oncoming wave front originating from the sources wherever located.
In a hypothetical where the moving ovserver passes he midpoint just as the light sources are pulsed on and subsequently measuring the oncoming light then the light from the rear the observer can determine if the "midpoint" he crossed is the midpoint of the sources (because that is a given,) of light, but his information is restricted to the midpoint of the colliding wave fronts. Do you follow what I am saying? The moving observer, knowing his velocity and the fact he zeroed his timer when crossing the midpoint can determine if the subsequent pulses (photons) were emitted simultaneously, this moving observer can only do this with respect to (analysis of) the wave fronts of the emitted lights, each wave front moving at equal velocities and each wave front is located equidistant from the midpoint from the instant the pulses (photons) were turned on.
e. No there isn't any reason I cannot use 'photon' in place of 'pulse'. Was this terminology that confusing?
