Meantone diesis
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Meantone diesis is a meantone interval of -12 fifths. It arises as a diminished second.
-12 fifths in meantone, a meantone diesis, is 524288/531441, an inverse Pythagorean comma, and 32768/32805, an inverse schisma, but also 2048/2025, 128/125, 648/625.
In septimal meantone where aside from 81/80 also 126/125 and 225/224 are tempered out, the meantone diesis is also 36/35 and 64/63 and 50/49.
- In undecimal meantone, the meantone diesis is also 100/99 and 45/44 and 56/55.
- In undecimal meanpop, the meantone diesis is also 55/54 and 33/32.