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- TL;DR Summary
- A method for measuring the one way speed of light.

Note, it possible to determine if the speed of light varies depending on direction, with the use of a single clock. Simply send a beam and reflect it back, but on the return trip introduce a medium to slow the beam.

Three cases, T1, T2, T3 are total travel times.

T1: assume light is the same speed in both directions (prior to introducing medium).

T2: assume light is faster on the outbound trip (prior to introducing medium).

T3: assume light is faster on the inbound trip (prior to introducing medium).

Let T1 = T2 = T3 without the medium.

Calculations show that with the medium, it is necessarily the case that T3 < T1 < T2

Sample below with c = 300,000 km/s and distance 1 km for convenience.

T1: Outbound 300,000 km/s, 1 km then inbound 300,000 km/s, 1km. T1 = 1/150,000 seconds.

T2: Outbound 600,000 km/s, 1 km then inbound 200,000 km/s, 1 km. T2 = 1/150,000 seconds.

T3: Outbound 200,000 km/s, 1 km then inbound 600,000 km/s, 1 km. T3 = 1/150000 seconds.

T1 = T2 = T3 ... impossible to verify which case exists.

T1: Outbound 300,000 km/s, 1 km then inbound 150,000 km/s, 1km. T1 = .00001 seconds.

T2: Outbound 600,000 km/s, 1 km then inbound 100,000 km/s, 1 km. T2 = .000017 seconds.

T3: Outbound 200,000 km/s, 1 km then inbound 300,000 km/s, 1 km. T3 = .0000083 seconds.

T3 < T1 < T2 ...

Three cases, T1, T2, T3 are total travel times.

T1: assume light is the same speed in both directions (prior to introducing medium).

T2: assume light is faster on the outbound trip (prior to introducing medium).

T3: assume light is faster on the inbound trip (prior to introducing medium).

Let T1 = T2 = T3 without the medium.

Calculations show that with the medium, it is necessarily the case that T3 < T1 < T2

Sample below with c = 300,000 km/s and distance 1 km for convenience.

__First without the medium__T1: Outbound 300,000 km/s, 1 km then inbound 300,000 km/s, 1km. T1 = 1/150,000 seconds.

T2: Outbound 600,000 km/s, 1 km then inbound 200,000 km/s, 1 km. T2 = 1/150,000 seconds.

T3: Outbound 200,000 km/s, 1 km then inbound 600,000 km/s, 1 km. T3 = 1/150000 seconds.

T1 = T2 = T3 ... impossible to verify which case exists.

__Second with the medium__(inbound velocity slowed by 50%)T1: Outbound 300,000 km/s, 1 km then inbound 150,000 km/s, 1km. T1 = .00001 seconds.

T2: Outbound 600,000 km/s, 1 km then inbound 100,000 km/s, 1 km. T2 = .000017 seconds.

T3: Outbound 200,000 km/s, 1 km then inbound 300,000 km/s, 1 km. T3 = .0000083 seconds.

T3 < T1 < T2 ...

**.***possible to verify which case exists*