The data indicates that that the speed of light was around 2.6% faster in 1675 then it is today.
I highly doubt that because the implications on Special Relativity would be enormous. Quite frankly if anyone debunked Special Relativity it would certainly achieve world headlines.
I'm familiar with Humphrey's Setterfield's work, which once you get passed all the distortion basically says that God made it
appear as if the earth is old, but is actually not.
It's an absurdity.
"Political correctness is tyranny with manners." -- Charlton Heston