I didn't say fiber optics is a vacuum.<quoted text>
Fiber optics is not a vacuum. In fact, it is material designed for a specific purpose, and is calibrated and timed to measure according to that design. It will be constant because of that.
And, yes... it is designed. It does what it's designed to do.
That's the point.
Theory lead to application.
The application confirms the theory.
Reflectometry is nothing new.
RADAR is time domain dependent.
How long has RADAR been around?
Yeah!What speed does the light travel in that controlled circumstances?[QUOTE]
Depends on the fiber. All fiber is not created equal.
[QUOTE]As you noted, there are temperature and other effects on even that controlled circuitry, which is powered to a level high enough to overcome most of the environment. Trillions of miles of space has lots of interference. I'm just saying they don't have enough info or sufficient testing to create an absolute speed of light, and then use that figure to measure the cosmos, then present that as absolutes.[QUOTE]
I wasn't talking about trillions of miles of space... or measuring the cosmos. Just one tiny part of it.
I was talking about a few miles of optical fiber.
[QUOTE]We had testboard men in the old days that could pit you within feet of a bad copper splice with Wheatstone bridges, cable maps, and ambient air temp.
Think of what they could do today.
It's getting done... everyday.