Definition of kilogram, amp, and kelvin set to change forever

[nhengineer]

They are wrong about the speed of light remaining constant in a vacuum light is effected by gravitational fields for one I think it was Feynman who lectured on the principals of light speed with varying time lapses
To quote Richard Feynman "...there is also an amplitude for light to go faster (or slower) than the conventional speed of light. You found out in the last lecture that light doesn't go only in straight lines; now, you find out that it doesn't go only at the speed of light! It may surprise you that there is an amplitude for a photon to go at speeds faster or slower than the conventional speed, c."
What this means to the redneck in me is that no matter who well defined some may think their unit of measurement is there will always be someone who will come along later or has previously debunked your absolutes.

Frank S, you are obviously a clear thinker so please respond to my question regarding the speed of light that I have been asking every person of similar awareness as you for the last sixty years. That would be, the speed of light relative to what exactly? Nothing in the universe is stationary; therefore, the speed of light must be relative to the body emitting it. If that body is moving at, say 3,000 cubits per second relative to the nearest body of mass (which itself is also moving by the way), then the speed of the photons being emitted must be equal to their speed relative to the body emitting them added to the speed of the emitting body but only if the emitting body is moving in the opposite direction as the body of reference. I could carry that out quite a bit further but I save that of another time.

I used cubits as a unit of measure because it is defined as from 17-1/2" to 20-6/10" which is accurate enough for me.