Lordjeebus said:
with a 5% change over 100 degrees, the speed of sound changes by about 2.6%. v = f*lambda, f = constant, so the wavelength changes also by about 2.6%. Not that this means anything for our perception of sound, as noted above. Even if frequency somehow changed by this amount, the difference between, say, 500 and 510 Hz isn't the kind of thing that's going to make us say "whoa, it sounds totally different."
If I remember right, a note can go from flat to sharp in about 40 hz, and that is a noticable change. so a 5% change from 2,000 hz to 2,040 hz would be detectable.
As far as measuring time without clocks, ancient cultures like the central Americans and druids had accurate calenders, and they would have noticed if the earth were moving 5% slower.
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