20/9
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| Ratio | 20/9 |
| Factorization | 22 × 3-2 × 5 |
| Monzo | [2 -2 1⟩ |
| Size in cents | 1382.4037¢ |
| Name | Ptolemaic ninth |
| Color name | y9, yo 9th |
| FJS name | [math]\text{M9}^{5}[/math] |
| Tenney height (log2 nd) | 7.49185 |
| Weil height (log2 max(n, d)) | 8.64386 |
| Wilson height (sopfr (nd)) | 15 |
| Harmonic entropy (Shannon, [math]\sqrt{nd}[/math]) |
~4.22499 bits |
| open this interval in xen-calc | |
20/9, the Ptolemaic ninth; the ratio between the 20th and 9th harmonics; one octave above 10/9.