TWO EVENTS OCCUR SIMULTANEOUSLY

Given that -

at t = 0, let the mathematical Event E occur at mathematical point E having the coordinates EXYZ

at t = 0, let the mathematical Event F occur at mathematical point F having the coordinates FXYZ

Observers see event horizons from simulutaneous events -

(t = 0 comes before t = and then t = 2, etc.)

at t = 1, point A receives the physical horizon from the event E in the matter form of photons.
at t = 2, point A observes different physical photons arriving from event F.
at t = 1, point B receives the horizon from the event F.
at t = 2, point B observes photons arriving from event E.
at t = 1, point C receives the physical horizon from the event E and a different physical horizon from event F simultaneously.

After point A and B and C, compare receipt times for the event horizons of E and F, the determination as to which came first seems impossible.

One of three conditions still exists, and can not be differentiated by the these observations.

Point A sees event horizon E then event horizon F because at t = 2, point A now is closer to event E's original location at t = 0, than it is now to event F's original location at t = 0.

Point B sees event horizon F then event horizon E because at t = 2, point B now is closer to event F's original location at t = 0, than it is now to event E's original location at t = 0.

Point C sees event horizon E and event horizon F simultaneously because at t = 1, point C now lies in the plane that was halfway between event E and event F at t = 0.

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