relevance to the two-slit experiment
I'm an imager, not a relativist, so add salt.
The concept of the photon's departure event and arrival event having the same time coordinate in the photon's reference frame seems very useful.
In the two-slit experiment, for the photon, there is no WHILE. It is at the source, the open slit, the closed slit, and the screen, all at the same time.
I would dearly like to see a decent explanation of the arcane variants of the two-slit experiment, written "in this light", if you'll excuse the pun.
Explanations "in this light" may also help with dismissing possibly content-free statements like "SN1987a occurred millions of years ago".
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