638/637

638/637, the moirisma is a 29-limit superparticular comma measuring about 2.72 cents. It is the amount by which a stack of 8/7 and 29/26 exceeds 14/11. By tempering it out is defined the moirismic temperament, which enables the moirismic chords.

Interval information

Ratio	638/637
Factorization	2 × 7-2 × 11 × 13-1 × 29
Monzo	[1 0 0 -2 1 -1 0 0 0 1⟩
Size in cents	2.715662¢
Name	moirisma
Color name	29o3u1orr-2, twenothuloruru negative 2nd, Twenothuloruru comma
FJS name	[math]\displaystyle{ \text{m}{-2}^{11,29}_{7,7,13} }[/math]
Special properties	superparticular, reduced
Tenney norm (log2 nd)	18.6326
Weil norm (log2 max(n, d))	18.6348
Wilson norm (sopfr(nd))	69
Comma size	unnoticeable
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Etymology

The name moirisma was named by Xenllium in 2025. It refers to 638 Moira, the asteroid. Which was in turn named after Moirai, Greek goddess of fate.

See also

• Unnoticeable comma
• List of superparticular intervals