15/13: Difference between revisions
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m +FJS name; cleanup |
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| Monzo = 0 1 1 0 0 -1 | | Monzo = 0 1 1 0 0 -1 | ||
| Cents = 247.74105 | | Cents = 247.74105 | ||
| Name = tridecimal ultramajor second, <br>tridecimal | | Name = tridecimal ultramajor second, <br>tridecimal inframinor third | ||
| Color name = 3uy2, thuyo 2nd | | Color name = 3uy2, thuyo 2nd | ||
| FJS name = A2<sup>5</sup><sub>13</sub> | | FJS name = A2<sup>5</sup><sub>13</sub> | ||
Revision as of 11:47, 20 September 2020
| Interval information |
tridecimal inframinor third
[sound info]
In 13-limit Just Intonation, 15/13 is an interval measuring about 247.7¢. In the language of Margo Schulter, 15/13 is an instance of an interseptimal interval, as it falls in an ambiguous zone between two septimal extremes – namely the large major second 8/7 and the small minor third 7/6. (15/13)×(13/10) = 3/2, which implies that 15/13 and 13/10 make a 3/2 perfect fifth. Thus you can make a root-3rd-P5 triad that goes 26:30:39, with a 15/13 "inframinor third" up from the root. When being used as type of second, it is given the name "ultra second" as it is even sharper than 8/7 which is often called a "supermajor second".