81/70: Difference between revisions
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| Name = septimal semiaugmented second, <br>septimal ultramajor second | | Name = septimal semiaugmented second, <br>septimal ultramajor second | ||
| Color name = rg2, rugu 2nd | | Color name = rg2, rugu 2nd | ||
| FJS name = M2<sub>35</sub> | |||
| Sound = | | Sound = | ||
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Revision as of 20:15, 27 September 2020
| Interval information |
septimal ultramajor second
81/70, the septimal semiaugmented second or septimal ultramajor second is a 7-limit interseptimal ratio of about 253 cents. It is sharp of a subminor third 7/6 by a sensamagic comma 245/243, and sharp of a major second 16/9 by a septimal quartertone 36/35.
It is also sharp of a minor third 6/5 by a subminor second 28/27. For this fact it is useful in the Canovian chord and provides the function of a voice leading up to the minor third.
The interval is so perfectly approximated by 19-edo, with an error of 0.05 cents. There are a number of edos that do this equally well, 171-edo to name one. The first edo that does this better than 19-edo with patent val is 660-edo.