Accu-tip and question

[Newton Hunt]

I'm wondering what could change the math used to calculate
inharmonicity.  Alien space rays?

I originally posted this observation, that FAC values, especially the A,
change with the humidity changes from 15% to 85% on the same piano in
the same room.  At a university tuners tune the same piano time after
time after time and some things become obvious in that setting that do
not otherwise.

Water content changes the speed of sound in the wood or the change of
crown or bearing or change of alien rays.

When the A changes from 6 to a 9 it is hard to account for such without
alien rays.

                        Newton