Don't buy any of it.
I can certainly understand different standards throughout history due to region or instrument maker.
If a 15th century violin maker created a masterpiece to sing at xxxHz, then by all means tune the rest of the orchestra to that standard, but don't cloud the issue with gobbledygook about the Earth's resonance.
The Earth is ever changing in displacement, density, and disposition. It may oscillate at 7~8hz, but that is due to external stimuli, and doesn't necessarily reflect it's resonance. Gravity, tides, storms, magnetic fields, solar wind and radiation all affect the planet's oscillation.
If resonance is defined as the frequency at which an object reflects the most of, if not more than, the energy level of external stimuli, then I'm not even sure the Earth's resonance can be statically measured.
The violin can be made to resonate at practically any pitch, but only with the strong, direct stimulus of the bow. Set upon the table, at which note, played by another source, does it begin to uncontrollably resonate sympathetically. That's it's resonant frequency, subject to humidity variations.
When a singer attempts to shatter a crystal goblet by singing at it's resonant frequency, the glass is always empty. Liquid would constantly change the target freq, rendering the task impossible with a single human voice.
Put your A440 tuning fork in the freezer overnight. First time you strike it in the morning it will not vibrate at 440hz.
Starting to see any parallels here?
Earth's shape shifts minutely. It's temperatures vary widely between regions and seasons. It has a liquid core. All these would affect a resonance point, and shift it accordingly.
Just an old guy rambling.
I can certainly understand different standards throughout history due to region or instrument maker.
If a 15th century violin maker created a masterpiece to sing at xxxHz, then by all means tune the rest of the orchestra to that standard, but don't cloud the issue with gobbledygook about the Earth's resonance.
The Earth is ever changing in displacement, density, and disposition. It may oscillate at 7~8hz, but that is due to external stimuli, and doesn't necessarily reflect it's resonance. Gravity, tides, storms, magnetic fields, solar wind and radiation all affect the planet's oscillation.
If resonance is defined as the frequency at which an object reflects the most of, if not more than, the energy level of external stimuli, then I'm not even sure the Earth's resonance can be statically measured.
The violin can be made to resonate at practically any pitch, but only with the strong, direct stimulus of the bow. Set upon the table, at which note, played by another source, does it begin to uncontrollably resonate sympathetically. That's it's resonant frequency, subject to humidity variations.
When a singer attempts to shatter a crystal goblet by singing at it's resonant frequency, the glass is always empty. Liquid would constantly change the target freq, rendering the task impossible with a single human voice.
Put your A440 tuning fork in the freezer overnight. First time you strike it in the morning it will not vibrate at 440hz.
Starting to see any parallels here?
Earth's shape shifts minutely. It's temperatures vary widely between regions and seasons. It has a liquid core. All these would affect a resonance point, and shift it accordingly.
Just an old guy rambling.
