# 22nd-octave temperaments

**Fractional-octave temperaments**

← 21st-octave temperaments 22nd-octave temperaments 23rd-octave temperaments →

22edo is a notable tuning system, and as such it gives rise to some fractional-octave temperaments. This page accommodates a number of temperaments that are otherwise difficult to catalog because they belong to multiple families. Vigintiduo has the same 7-limit mapping as 22et with harmonic 11 mapped to an independent generator. Vigin has the same 11-limit mapping as 22et with harmonic 13 mapped to an independent generator.

See also:

## Vigintiduo

Subgroup: 2.3.5.7.11

Comma list: 50/49, 64/63, 245/243

Mapping: [⟨22 35 51 62 0], ⟨0 0 0 0 1]]

Optimal tuning (POTE): ~36/35 = 1\22, ~11/8 = 557.563

Optimal ET sequence: 22, 66de, 88bde, 110bd, 198bcdde

Badness: 0.048372

## Vigin

Subgroup: 2.3.5.7.11.13

Comma list: 50/49, 55/54, 64/63, 99/98

Mapping: [⟨22 35 51 62 76 0], ⟨0 0 0 0 0 1]]

Optimal tuning (POTE): ~33/32 = 1\22, ~13/8 = 844.624

Badness: 0.029849

## Major arcana

Named after a subset of Tarot cards of which there is 22. Tempers out the [-193 154 -22⟩ comma in the 5-limit. Can be conceptualized as a more precise version of icosidillic in the 5-limit and the 7-limit bearing the same pergen (P8/22, P5), however there's no single way to extend it to the 11-limit due to inconsistency.

Subgroup: 2.3.5

Comma list: [-193 154 -22⟩

Mapping: [⟨22 22 -39], ⟨0 1 7]]

- mapping generators: ~[79 -63 9⟩, ~3/2

Optimal tuning (CTE): ~3/2 = 701.942

Supporting ETs: 176, 330, 506, 836, 1342, 1848, ...

### 7-limit

Subgroup: 2.3.5.7

Comma list: 14348907/14336000, [39 11 -11 -11⟩

Mapping: [⟨22 0 -193 271], ⟨0 1 7 -6]]

- mapping generators: ~8388608/8103375, ~3/2

Optimal tuning (CTE): ~3/2 = 702.014

Supporting ETs: 176, 506, 682

## Bibium

Bibium is named after an "extended provisional name" for the 22nd element titanium, which is needed to resolve a name conflict as Titanium is already a temperament. It reaches 11/8 and 7/6 in one generator, and as a corollary tempers 96/77 to 7 steps of 22edo.

Subgroup: 2.3.5.7.11

Comma list: 2401/2400, 9801/9800, 2166612408926208/2162550048828125

Mapping: [⟨22 2 10 33 72], ⟨0 8 10 7 1]]

Mapping generators: ~48125/46656 = 1\22, 4296875/3779136 = 224.101

Optimal tuning (CTE): ~4296875/3779136 = 224.101

Supporting ETs: 198, 616, 814, 1012, 1210

### 13-limit

Subgroup: 2.3.5.7.11.13

Comma list: 2401/2400, 9801/9800, 67392/67375, 142884/142805

Mapping: [⟨22 2 10 33 72 28], ⟨0 8 10 7 1 3]]

Mapping generators: ~65/63 = 1\22, 338/297 = 224.100

Optimal tuning (CTE): ~338/297 = 224.100