20/9

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

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
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