Rodan comma

From Xenharmonic Wiki
(Redirected from Roda)
Jump to navigation Jump to search
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]\text{m2}^{5,5,5}[/math]
Special properties reduced
Tenney height (log2 nd) 53.9101
Weil height (log2 max(n, d)) 53.9316
Wilson height (sopfr(nd)) 106
Harmonic entropy
(Shannon, [math]\sqrt{nd}[/math])
~4.28325 bits
Comma size small
open this interval in xen-calc

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. As part of the syntonic–diatonic equivalence continuum, it is the difference between the Pythagorean diatonic semitone (256/243) and a stack of three syntonic commas. It is also the amount by which a stack of three acute whole tones (729/640) falls short of the perfect fifth.

Temperaments

Tempering out this comma leads to the 5-limit version of rodan.