If light is emitted and absorbed at the same instant, how does it know when/where in spacetime it's been emitted and absorbed?
You cannot apply SR to light in this naive way. SR works just fine for anything with mass, but without a theory of quantum gravity no one has the first clue how massless particles operate in spacetime, or what they do or don't "experience."
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I wish people would stop repeating this.
If light is emitted and absorbed at the same instant, how does it know when/where in spacetime it's been emitted and absorbed?
You cannot apply SR to light in this naive way. SR works just fine for anything with mass, but without a theory of quantum gravity no one has the first clue how massless particles operate in spacetime, or what they do or don't "experience."