638/637

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 height (log2 nd)	18.6326
Weil height (log2 max(n, d))	18.6348
Wilson height (sopfr(nd))	69
Harmonic entropy (Shannon, [math]\displaystyle{ \sqrt{nd} }[/math])	~1.26847 bits
Comma size	unnoticeable
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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.

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