63/40

Interval information
Ratio	63/40
Factorization	2-3 × 32 × 5-1 × 7
Monzo	[-3 2 -1 1⟩
Size in cents	786.4222 ¢
Name	aberschismic minor sixth
Color name	zg6, zogu 6th
FJS name	[math]\displaystyle{ \text{m6}^{7}_{5} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	11.2992
Weil norm (log2 max(n, d))	11.9546
Wilson norm (sopfr(nd))	24
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63/40, the aberschismic minor sixth, is a 7-limit interval which is flat of the Pythagorean minor sixth by an aberschisma (5120/5103). It is well approximated in several equal step tunings, most notably 99edo.

Terminology

It is known less specifically as the narrow minor sixth in Scala.