12/7

Interval information

Ratio	12/7
Factorization	22 × 3 × 7-1
Monzo	[2 1 0 -1⟩
Size in cents	933.1291¢
Names	supermajor sixth, septimal major sixth
Color name	r6, ru 6th
FJS name	[math]\displaystyle{ \text{M6}_{7} }[/math]
Special properties	reduced
Tenney height (log2 nd)	6.39232
Weil height (log2 max(n, d))	7.16993
Wilson height (sopfr(nd))	14
[sound info]
Open this interval in xen-calc

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Septimal major sixth

In 7-limit just intonation, 12/7 is the supermajor sixth or septimal major sixth of about 933.1¢. It represents the interval between the 12th and 7th harmonics and appears in chords such as 4:5:7:9:12. It differs from the 5-limit major sixth of 5/3 by 36/35 – the septimal quartertone – a superparticular interval of about 48.8¢. It differs from the Pythagorean major sixth of 27/16 by 64/63 – Archytas' comma – about 27.3¢. And finally, it differs from the harmonic seventh of 7/4 by 49/48 – the large septimal diesis or slendro diesis – about 35.7¢. 12/7 is the inversion of the septimal subminor third of 7/6.

See also

• 7/6 – its octave complement
• Gallery of Just Intervals
• File:Ji-12-7-csound-foscil-220hz.mp3 – an alternative sound sample