28/27

Interval information

Ratio	28/27
Factorization	22 × 3-3 × 7
Monzo	[2 -3 0 1⟩
Size in cents	62.9609¢
Names	septimal chroma, septimal third-tone, subminor second, septimal minor second
Color name	z2, zo 2nd
FJS name	[math]\displaystyle{ \text{m2}^{7} }[/math]
Special properties	superparticular, reduced
Tenney height (log2 nd)	9.56224
Weil height (log2 max(n, d))	9.61471
Wilson height (sopfr(nd))	20
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The superparticular interval 28/27 (also septimal chroma or septimal third-tone) has the seventh triangular number as a numerator and is the difference between 15/14 and 10/9, 9/8 and 7/6, 9/7 and 4/3, 3/2 and 14/9, 12/7 and 16/9, and 9/5 and 28/15.

If treated as an interval in its own right, it may be described as the septimal minor second, since it differs from the Pythagorean minor second 256/243 by 64/63, and from 16/15 by 36/35. This is analogous to the septimal major second 8/7, which has the same relationship with 9/8 and 10/9, respectively. Such classification suggests the function of a strong leading tone added to the traditional harmony.

See also

• Gallery of Just Intervals
• 27/14 - its inverse interval
• Septimal third tone - Wikipedia