> Time measures change over space, a thing you witness firsthand when your yodel returns in echo from the mountain. If space did not change from point A to point B, there would be no distance, no coordinate system, and our yodel would not echo from anywhere.

I'm still not following what you mean. What is "space"? You claim it is real, in the same sense that a physical clock is real. Is it some kind of physical thing in the world? Is it the general idea that two objects can occupy different positions?

What does it even mean for "space" to "change"? Does it refer to the existence of different positions? Does it refer to the idea that a physical object can change which position it occupies? Why does the concept of distance depend on the existence of "change over space"? We can make the obvious observation of transmitting a sound to a distant object and receiving an echo back. But I don't see how to derive your concept of "change over space" from such an observation.

Further, why is "change over space" in particular the quantity that "time" measures? Normally, I'd think that "time" refers only to the intrinsic relationship between different events that allows us to place them in an ordered sequence. What does this necessarily have to do with "change over space"?