# Gravity family

(Redirected from Gravid)

The gravity family tempers out graviton, the 5-limit comma 129140163/128000000 = [-13 17 -6. The graviton equals (81/80)4/(25/24), so that four 81/80 commas come to a classic chromatic semitone. The generator of gravity temperament is a grave fifth of 40/27, and hence the name. It is part of the syntonic-chromatic equivalence continuum, whereby (81/80)k = 25/24.

Full 7-limit extensions of gravity include gravid (58&65), marvo (65d&72), zarvo (65&72), and harry (58&72), all considered below. A notable subgroup extension is larry.

## Gravity

Subgroup: 2.3.5

Comma list: 129140163/128000000

Mapping: [1 5 12], 0 -6 -17]]

Mapping generators: ~2, ~40/27

POTE generator: ~40/27 = 683.156

### Larry

Subgroup: 2.3.5.11

Comma list: 243/242, 4000/3993

Sval mapping: [1 5 12 12], 0 -6 -17 -15]]

Gencom mapping: [1 5 12 0 12], 0 -6 -17 0 -15]]

Gencom: [2 40/27; 243/242 4000/3993]

POTE generator: ~40/27 = 683.166

Optimal GPV sequence: 7, 37ccee, 44ce, 51ce, 58, 65, 137, 202

## Harry

Main article: Harry

Harry temperament can be described as 58&72 temperament, tempering out 7-limit commas 2401/2400 and 19683/19600; 11-limit commas 243/242, 441/440 and 4000/3993, leading to a period of a half octave and a generator of minor semitone tempered between 21/20 and 22/21. Harry temperament also equates 14/13 with 27/25 in the 13-limit, 17/16 with 18/17 and 13/11 with 20/17 in the 17-limit.

Subgroup: 2.3.5.7

Comma list: 2401/2400, 19683/19600

Mapping: [2 4 7 7], 0 -6 -17 -10]]

Wedgie⟨⟨12 34 20 26 -2 -49]]

POTE generator: ~21/20 = 83.156

### 11-limit

Subgroup: 2.3.5.7.11

Comma list: 243/242, 441/440, 4000/3993

Mapping: [2 4 7 7 9], 0 -6 -17 -10 -15]]

POTE generator: ~21/20 = 83.167

Optimal GPV sequence: 14c, 58, 72, 130, 202

### 13-limit

Subgroup: 2.3.5.7.11.13

Comma list: 243/242, 351/350, 364/363, 441/440

Mapping: [2 4 7 7 9 11], 0 -6 -17 -10 -15 -26]]

POTE generator: ~21/20 = 83.116

Optimal GPV sequence: 14cf, 58, 72, 130, 332f, 462ef

### 17-limit

Subgroup: 2.3.5.7.11.13.17

Comma list: 221/220, 243/242, 289/288, 351/350, 441/440

Mapping: [2 4 7 7 9 11 9], 0 -6 -17 -10 -15 -26 -6]]

POTE generator: ~21/20 = 83.168

Optimal GPV sequence: 14cf, 58, 72, 130, 202g

## Gravid

Subgroup: 2.3.5.7

Comma list: 126/125, 1605632/1594323

Mapping: [1 -1 -5 -14], 0 6 17 39]]

Wedgie⟨⟨6 17 39 13 45 43]]

POTE generator: ~27/20 = 517.140

### 11-limit

Subgroup: 2.3.5.7.11

Comma list: 126/125, 243/242, 896/891

Mapping: [1 -1 -5 -14 -3], 0 6 17 39 15]]

POTE generator: ~27/20 = 517.155

Optimal GPV sequence: 58, 123, 181ce

## Marvo

Subgroup: 2.3.5.7

Comma list: 225/224, 78125000/78121827

Mapping: [1 5 12 29], 0 -6 -17 -46]]

Wedgie⟨⟨6 17 46 13 56 59]]

POTE generator: ~27/20 = 516.694

### 11-limit

Subgroup: 2.3.5.7.11

Comma list: 225/224, 243/242, 4000/3993

Mapping: [1 5 12 29 12], 0 -6 -17 -46 -15]]

POTE generator: ~27/20 = 516.699

Optimal GPV sequence: 65d, 72, 281, 353c, 425bc, 497bc

### 13-limit

Subgroup: 2.3.5.7.11.13

Comma list: 225/224, 243/242, 351/350, 1625/1617

Mapping: [1 5 12 29 12 39], 0 -6 -17 -46 -15 -62]]

POTE generator: ~27/20 = 516.730

Optimal GPV sequence: 65d, 72, 137, 209, 281f, 490bcf

## Zarvo

Subgroup: 2.3.5.7

Comma list: 4375/4374, 33075/32768

Mapping: [1 -1 -5 14], 0 6 17 -26]]

Wedgie⟨⟨6 17 -26 13 -58 -108]]

POTE generator: ~27/20 = 516.702

### 11-limit

Subgroup: 2.3.5.7.11

Comma list: 243/242, 385/384, 4000/3993

Mapping: [1 -1 -5 14 -3], 0 6 17 -26 15]]

POTE generator: ~27/20 = 516.691

Optimal GPV sequence: 65, 72, 353cd

### 13-limit

Subgroup: 2.3.5.7.11.13

Comma list: 169/168, 243/242, 325/324, 385/384

Mapping: [1 -1 -5 14 -3 8], 0 6 17 -26 15 -10]]

POTE generator: ~27/20 = 516.667

Optimal GPV sequence: 65f, 72