Meinl Tuning Fork Sidereal Day
Meinl Tuning Fork Sidereal Day TF-E-SI; Description: Duration of one exact earth-rotation around its axis, measured from a fixed-star-position. (~ 23h 56 min.); Position to sun: 3rd planet; Orbital period in days: 23h 56 min; Orbital period in seconds: 86164.09054; Frequency calculation: 1/86164.09054 sec. = 0.0000116 Hz, (0.0000116 Hz x 2) 223 = 194.71 Hz; Frequency: 194.71 Hz (= 24. Octave); Tone: G3; Shifted 440 Hz standard-pitch: A4/a' = 437.11 Hz, Made in Germany
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