One-Way Light Speed Measurement with One Clock

This document proposes an experiment to measure the one-way speed of light using only one local clock. The core idea is to keep the clock fixed at point A and use a predictable mechanical blocker to mark a distant blocking event at point B according to the clock at A. The local time at B is not used. A blocker moves through a known path with a known constant motion. The blocker passes point A, and that passage is recorded by the clock at A. Because the path and motion are known, the arrival of the blocker at B is calculated according to the same clock at A. When the blocker reaches B, it interrupts the laser beam. The interruption of the light then propagates from B to A, where the sensor records the detection time using the clock at A.