Meinl Tuning Fork Sidereal TTF-M-SI
Meinl Tuning Fork Sidereal TTF-M-SI, Tuning Fork, Planets series, Description: Duration of one orbit around the Earth measured from a fixed star position, The orbital period in days: 27.321661, The orbital period in seconds: 2,360,591.51, Calculation of frequency: 1/2,360,591.51 sec = 0.00000042 Hz (0.00000042 Hz x 2) 2 to the 28th power = 227.43 Hz, Frequency: 227.43 Hz (octave = 29), Tone: A#3, Shifted standard tuning 440 Hz: A4/a' = 429,33 Hz, Made in Germany