Physics Path II · Developed alongside Speed Without a Message
Propagation, Encounter & Observation
What moves at \(c\), and what does not have to? Separate the travelling wave from the rate at which it meets a moving receiver, then separate both from local measurement, clock construction and the distant-time coordinate system built afterwards.
Topics
Read in sequence or choose a question
Propagation Speed Is Not Encounter Rate
A light front may propagate at \(c\) while its separation from a moving receiver closes at \(c\pm v\).
CLOCKSEinstein Synchronization: What Is Measured and What Is Assigned
One clock measures the round trip; a synchronization rule assigns the distant one-way split.
GEOMETRYWhat the Train Argument Actually Establishes
Reception geometry is separated from the stronger coordinate conclusions later attached to it.
RECORDThe Clock Has Not Aged by Seeing
A completed source history and the cadence at which a moving receiver later encounters its travelling record are different physical stages.
PHENOMENON → TESTWhat Doppler Cancellation Leaves Behind
Real clock constructions suppress first-order Doppler sensitivity; reciprocal two-direction intervals expose an even-in-motion structure without yet specifying the exact clock mechanism.
TRANSFORMATIONThe Wrong Problem
What physical interpretation do the successful Lorentz coordinate relations require once propagation, encounter, clock response and synchronization have been separated?