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Re:A proof of the constancy of the velocity of light (1913) by g82918 on Sunday January 19, 2020 @02:37AM (#22090014)
People have at least once though the citation escapes me, it was 2006ish. And it could be found in agreement with observation. Not that I believe in it.
Re:A proof of the constancy of the velocity of light (1913) by eesmith on Sunday January 19, 2020 @05:12AM (#22090554)
I missed this the first time - https://en.wikipedia.org/wiki/Variable_speed_of_light (I used Google Scholar to find that first reference).

There are about a dozen references in the 2006ish timeframe.