I don't believe you can say for certainty that your theory is correct without being able to actually check.
That's what I'm talking about when I say it is checked. You're saying it can only be checked in one specific way.
No, I'm saying without actually checking we're just guessing based on what we can know so far. It isn't science in the sense there's no way to refute the null hypothesis. It's interesting, but no need to pretend we're certain. This is a major problem in all research but it is most obvious in things like astronomy or archaeology.
What is "actual checking"?
In my example about the 300' x 500' property nobody needs to actually check that it's 583' 1-1/8" from corner to diagonal corner. It can be calculated and is known to be correct. If someone came along and insisted that I get a tape measure and check, I would rightly just laugh at them and tell them to learn some geometry.
I already said a couple of replys back, there's a lot of assumptions that the measurements require. Just because the math works in theory doesn't mean there are as yet undicovered factors the equations don't take into account. Like I said before, there are tons of examples all through history of instances where the theories were logical, rigorous, and wrong. Assuming a constant speed of light through all of space is a big assumption considering we've never even left the solar system.
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