Rodan comma

Interval information

Ratio	131072000/129140163
Factorization	220 × 3-17 × 53
Monzo	[20 -17 3⟩
Size in cents	25.70613¢
Names	rodan comma, roda
Color name	sasa-triyo 2nd, ssy32
FJS name	[math]\displaystyle{ \text{m2}^{5,5,5} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	53.9101
Weil norm (log2 max(n, d))	53.9316
Wilson norm (sopfr(nd))	106
Comma size	small
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The rodan comma (monzo: [20 -17 3⟩, ratio: 131072000/129140163), otherwise known as the roda, is a small 5-limit comma of about 25.7 cents. It is the difference between the Pythagorean diatonic semitone (256/243) and a stack of three syntonic commas. Tempering it out leads to the 5-limit version of rodan.

See also

• Syntonic–diatonic equivalence continuum