19/18

Interval information

Ratio	19/18
Subgroup monzo	2.3.19 [-1 -2 1⟩
Size in cents	93.60301¢
Name	large undevicesimal semitone large undevicesimal limma undevicesimal minor second
Color name	19o2, ino 2nd
FJS name	[math]\displaystyle{ \text{m2}^{19} }[/math]
Special properties	superparticular, reduced
Tenney norm (log2 nd)	8.41785
Weil norm (log2 max(n, d))	8.49586
Wilson norm (sopfr(nd))	27
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In 19-limit just intonation, 19/18 is the large undevicesimal semitone, measuring about 93.6¢. It is sharp of the Pythagorean minor second (256/243) by 513/512, the undevicesimal comma aka Boethius' comma.

The small comma (39/35)/(19/18)² = 12636/12635 is tempered out in 53, 130, 140, 243, 270, 422, 513, 665, 742, 795, 935, 1065, 1178, 1205, 1308, 1395, 1448, 1578, 2000, 2190, 2243, 2460, 3125, 3178, 3395, and 4703 EDOs.

See also

• 36/19 – its octave complement, the undevicesimal major seventh.
• 20/19 – small undevicesimal semitone