Meinl Planetary Tuned Mercury Tuning Fork

Meinl Tuning Fork Merkur TF-ME, Planet Tuning Fork, Note: C#3, Determination of frequency: Duration of one orbit around the sun from the position of the 1st planet, Orbital period in years: 0.24, Orbital period in days: 87,969, Round trip time in seconds: 7600522, Frequency calculation: 1 / 7600522 sec = 0.0000001316 Hz, (0.0000001316 Hz \* 2) 2^29 = 141.27 Hz, Frequency: 141.27 Hz (30th octave), Shifted standard tuning 440 Hz: A4 / a' = 448.50 Hz, Made in Germany