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## Main Question or Discussion Point

If the speed of light would change in the universe without any other natural constant changing, would all clocks be affected in the same way by this?

This is implied by Einstein in this paper on page 368

http://myweb.rz.uni-augsburg.de/~eckern/adp/history/einstein-papers/1912_38_355-369.pdf where he says:

"Die Ganggeschwindigkeit ω der Gravitationsuhr ist also c proportional, wie dies für Uhren jeder Art der Fall sein soll." (The speed ω of the gravitational clock is thus proportional to c as it should be for clocks of all kinds.)

If this is true, how exactly would we detect a change in the speed of light (if it were variable for some reason)?

This is implied by Einstein in this paper on page 368

http://myweb.rz.uni-augsburg.de/~eckern/adp/history/einstein-papers/1912_38_355-369.pdf where he says:

"Die Ganggeschwindigkeit ω der Gravitationsuhr ist also c proportional, wie dies für Uhren jeder Art der Fall sein soll." (The speed ω of the gravitational clock is thus proportional to c as it should be for clocks of all kinds.)

If this is true, how exactly would we detect a change in the speed of light (if it were variable for some reason)?