in re this
Comes down to the measuring. stick.
Okay my favorite equation ever is that one whre you take the curl of the magnetic and electric fields do some simple math on them and devide the result into one.
gives you the speed of light. which is a Constant, because. . .because they say it is.
well, the two curls are constants, kinda. The magnetic one is based one Pi (take your calculator ot and devide Pi by four; now put a buch of zeros in front of that; you will be close).
Pi should not change.
the other is just some arbitrary number (I think) found by measurement or calculation and could change (like inside of a strong EM or gravity field ).
But our measuring stick cannot change, so everything about it must.
So the speed of lighi on mars must be the same as is on earth and time itself is different.
Eye. begins. to. twich.
Then you see that the damn stick is sometimes longer on one end than it is the other.
Realize that you are going mad anyway; might as well study quantum physics.