20/9: Difference between revisions

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{{Infobox Interval
{{Infobox Interval
| Name = Ptolemaic ninth
| Name = Ptolemaic ninth
| Color name = y9, yo 9th
}}
}}


Revision as of 18:55, 22 March 2024

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Interval information
Ratio 20/9
Factorization 22 × 3-2 × 5
Monzo [2 -2 1⟩
Size in cents 1382.404¢
Name Ptolemaic ninth
Color name y9, yo 9th
FJS name [math]\displaystyle{ \text{M9}^{5} }[/math]
Tenney norm (log2 nd) 7.49185
Weil norm (log2 max(n, d)) 8.64386
Wilson norm (sopfr(nd)) 15
Open this interval in xen-calc

20/9, the Ptolemaic ninth; the ratio between the 20th and 9th harmonics; one octave above 10/9.

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