129/128
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Ratio
129/128
Subgroup monzo
2.3.43 [-7 1 1⟩
Size in cents
13.47271¢
Name
43-limit comma (HEJI)
Color name
43o1, fotho unison
FJS name
[math]\text{P1}^{43}[/math]
Special properties
superparticular,
reduced,
reduced harmonic
Tenney height (log2 nd)
14.0112
Weil height (log2 max(n, d))
14.0225
Wilson height (sopfr(nd))
60
Harmonic entropy
(Shannon, [math]\sqrt{nd}[/math])
~2.68981 bits
Comma size
small
open this interval in xen-calc
| Interval information |
reduced,
reduced harmonic
(Shannon, [math]\sqrt{nd}[/math])
129/128, or the 43-limit Johnston comma (HEJI), is a 2.3.43 subgroup comma. It is the amount by which the octave-reduced 43rd harmonic 43/32 exceeds the perfect fourth (4/3). It is significant in the Functional Just System and Helmholtz-Ellis notation as the formal comma to translate a Pythagorean interval to a nearby quadragesimotertial interval.