20/9
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20/9, the Ptolemaic ninth; the ratio between the 20th and 9th harmonics; one octave above 10/9.
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This page is a stub. You can help the Xenharmonic Wiki by expanding it. |
Interval information |
20/9, the Ptolemaic ninth; the ratio between the 20th and 9th harmonics; one octave above 10/9.