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Interval information
Ratio 261/256
Subgroup monzo 2.3.29 [-8 2 1
Size in cents 33.487196¢
Names vicesimononal comma,
29-limit ~sixth tone (HEJI)
Color name 29o1, tweno unison
FJS name [math]\text{P1}^{29}[/math]
Special properties reduced
Tenney height (log2 nd) 16.0279
Weil height (log2 max(n, d)) 16.0558
Wilson height (sopfr (nd)) 51
Harmonic entropy
(Shannon, [math]\sqrt{nd}[/math])
~4.50549 bits
Comma size medium
open this interval in xen-calc

261/256, the vicesimononal comma, or the 29-limit ~sixth tone as is known in Helmholtz-Ellis notation, is a medium 2.3.29 subgroup comma. It is the amount by which 29/16 (the octave-reduced 29th harmonic) exceeds the Pythagorean minor seventh (16/9). It is significant in Helmholtz-Ellis notation and Functional Just System as the formal comma to translate a Pythagorean interval to a nearby undetricesimal interval.