Richard Clark wrote:
So Einstein is responsible for both setting the speed of light AND
time slowing down?

In a way, the answer is "yes". If the length of a second
is inviolate, then the speed-of-light is not a constant
since those are contradictory concepts.

A system of physics could have been based on an "absolute
objective second" of time, but it results in a total package
with a lot of problems as yet unsolved. An absolute velocity
of light in a vacuum seems to solve a lot of those problems
but results in length being a variable and time being a
variable while length and time are the dimensions of velocity.

Personally, I think everything is a variable and therefore,
there are no constants, except of course, for your constant
kibitzing. :-)
--
73, Cecil http://www.w5dxp.com