In the Sonic Geometry vid, there is no reference to C=256 or a Schumann resonance, because that is all wishful thinking and fuzzy math at best. Notice that these are the "math" and pseudoscience angles that are attacked, but it's the the wrong argument.

What is not fuzzy at all is math based on geometry, and this geometry is the basis for deriving the number 432, and the ratios resulting from geometric progressions are harmonically related, and produce a (just) major triad, etc., so the math is not fuzzy because geometry would be the same geometry regardless of Schumann.

What frequency is C in this system? Whatever it is it's derived from A, and probably it would be the just minor third, but it has nothing to do with C=256Hz or scientific pitch.

I am keeping an open mind regarding A432, and I encourage experimentation and observation. While I am not aware of any direct link between the geometry and a natural constructive resonance at 432Hz, I would have to plead ignorance;- I don't have enough information.

I do find it somewhat compelling that the history of pitch inflation generally includes correction points and Is observable is that "something" resists raising the standard, whatever the historic reasons have been for raising it.

The idea that the "second" is an arbitrary length of time assumes that the day is arbitrary, but it is not. Measuring frequencies in cycles/second is therefore not arbitrary either. Both the second and the Hertz are derived by dividing the day into equal intervals, based on the same mathematical system of geometry. The second has a complex definition now as an atomic vibration quantity, but that is just a comparison of that atom's frequency to a division of the day. One asks if the length of the day changed, would the length of the second be revised? No, and the reason is because for the purposes of science, we need an unchanging interval. The length of the day does change, but ever so slowly.