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Gravity family: Difference between revisions

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The '''gravity family''' tempers out [[graviton]], the 5-limit comma 129140163/128000000 = {{monzo| -13 17 -6 }}. The graviton equals (81/80)<sup>4</sup>/(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)<sup>''k''</sup> = 25/24.
{{Technical data page}}
The '''gravity family''' tempers out [[graviton]], the 5-limit comma 129140163/128000000 = {{monzo| -13 17 -6 }}. The graviton equals (81/80)<sup>4</sup>/(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&ndash;chromatic equivalence continuum]], whereby (81/80)<sup>''k''</sup> = 25/24.


== Gravity ==
== Gravity ==
{{main|Gravity}}
[[Subgroup]]: 2.3.5
[[Subgroup]]: 2.3.5


[[Comma list]]: 129140163/128000000
[[Comma list]]: 129140163/128000000


[[Mapping]]: [{{val| 1 5 12 }}, {{val| 0 -6 -17 }}]
{{Mapping|legend=1| 1 5 12 | 0 -6 -17 }}


Mapping generators: ~2, ~40/27
: mapping generators: ~2, ~40/27


[[Optimal tuning]] ([[POTE]]): ~2 = 1\1, ~27/20 = 516.844
[[Optimal tuning]] ([[POTE]]): ~2 = 1\1, ~27/20 = 516.844
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=== Overview to extensions ===
=== Overview to extensions ===
Full 7-limit extensions of gravity include marvo (65d &amp; 72), zarvo (65 &amp; 72), gravid (58 &amp; 65), and harry (58 &amp; 72), all considered below. A notable subgroup extension is larry.  
Full 7-limit extensions of gravity include marvo (65d &amp; 72), zarvo (65 &amp; 72), gravid (58 &amp; 65), and harry (58 &amp; 72), all considered below. A notable subgroup extension is larry.


=== Larry ===
There is also an unnamed 58 & 65d extension by tempering [[176/175]] to extend larry to include prime 7 and tempering [[847/845]] to extend it to the 13-limit, with an [[S-expression]]-based comma list of {[[5120/5103|S8/S9]], [[8019/8000|S9/S10]], [[4000/3993|S10/S11]], ([[847/845|S11/S13]],) [[144/143|S12]]}.
 
=== 2.3.5.11 subgroup (larry) ===
Subgroup: 2.3.5.11
Subgroup: 2.3.5.11


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


Sval mapping: [{{val| 1 5 12 12 }}, {{val| 0 -6 -17 -15 }}]
Sval mapping: {{mapping| 1 5 12 12 | 0 -6 -17 -15 }}


Gencom mapping: [{{val| 1 5 12 0 12 }}, {{val| 0 -6 -17 0 -15 }}]
Gencom mapping: {{mapping| 1 5 12 0 12 | 0 -6 -17 0 -15 }}


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


Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.834
Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.834
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[[Comma list]]: 225/224, 78125000/78121827
[[Comma list]]: 225/224, 78125000/78121827


[[Mapping]]: [{{val| 1 5 12 29 }}, {{val| 0 -6 -17 -46 }}]
{{Mapping|legend=1| 1 5 12 29 | 0 -6 -17 -46 }}
 
{{Multival|legend=1| 6 17 46 13 56 59 }}


[[Optimal tuning]] ([[POTE]]): ~2 = 1\1, ~27/20 = 516.694
[[Optimal tuning]] ([[POTE]]): ~2 = 1\1, ~27/20 = 516.694
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Comma list: 225/224, 243/242, 4000/3993
Comma list: 225/224, 243/242, 4000/3993


Mapping: [{{val| 1 5 12 29 12 }}, {{val| 0 -6 -17 -46 -15 }}]
Mapping: {{mapping| 1 5 12 29 12 | 0 -6 -17 -46 -15 }}


Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.699
Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.699
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Comma list: 225/224, 243/242, 351/350, 1625/1617
Comma list: 225/224, 243/242, 351/350, 1625/1617


Mapping: [{{val| 1 5 12 29 12 39 }}, {{val| 0 -6 -17 -46 -15 -62 }}]
Mapping: {{mapping| 1 5 12 29 12 39 | 0 -6 -17 -46 -15 -62 }}


Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.730
Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.730
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[[Comma list]]: 4375/4374, 33075/32768
[[Comma list]]: 4375/4374, 33075/32768


[[Mapping]]: [{{val| 1 5 12 -12 }}, {{val| 0 -6 -17 26 }}]
{{Mapping|legend=1| 1 5 12 -12 | 0 -6 -17 26 }}
 
{{Multival|legend=1| 6 17 -26 13 -58 -108 }}


[[Optimal tuning]] ([[POTE]]): ~2 = 1\1, ~27/20 = 516.702
[[Optimal tuning]] ([[POTE]]): ~2 = 1\1, ~27/20 = 516.702
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Comma list: 243/242, 385/384, 4000/3993
Comma list: 243/242, 385/384, 4000/3993


Mapping: [{{val| 1 5 12 -12 12 }}, {{val| 0 -6 -17 26 -15 }}]
Mapping: {{mapping| 1 5 12 -12 12 | 0 -6 -17 26 -15 }}


Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.691
Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.691
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Comma list: 169/168, 243/242, 325/324, 385/384
Comma list: 169/168, 243/242, 325/324, 385/384


Mapping: [{{val| 1 5 12 -12 12 -2 }}, {{val| 0 -6 -17 26 -15 10 }}]
Mapping: {{mapping| 1 5 12 -12 12 -2 | 0 -6 -17 26 -15 10 }}


Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.667
Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 516.667
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[[Comma list]]: 126/125, 1605632/1594323
[[Comma list]]: 126/125, 1605632/1594323


[[Mapping]]: [{{val| 1 5 12 25 }}, {{val| 0 -6 -17 -39 }}]
{{Mapping|legend=1| 1 5 12 25 | 0 -6 -17 -39 }}
 
{{Multival|legend=1| 6 17 39 13 45 43 }}


[[Optimal tuning]] ([[POTE]]): ~2 = 1\1, ~27/20 = 517.140
[[Optimal tuning]] ([[POTE]]): ~2 = 1\1, ~27/20 = 517.140
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Comma list: 126/125, 243/242, 896/891
Comma list: 126/125, 243/242, 896/891


Mapping: [{{val| 1 5 12 25 12 }}, {{val| 0 -6 -17 -39 -15 }}]
Mapping: {{mapping| 1 5 12 25 12 | 0 -6 -17 -39 -15 }}


Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 517.155
Optimal tuning (POTE): ~2 = 1\1, ~27/20 = 517.155
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Harry adds the [[breedsma]], 2401/2400, and the [[cataharry comma]], 19683/19600, to the set of commas, and may be described as the 58 &amp; 72 temperament. The [[period]] is half an [[octave]], and the generator ~21/20, with generator tunings of [[130edo|9\130]] or [[202edo|14\202]] being good choices. [[Mos]] of size 14, 16, 30, 44 or 58 are among the scale choices.
Harry adds the [[breedsma]], 2401/2400, and the [[cataharry comma]], 19683/19600, to the set of commas, and may be described as the 58 &amp; 72 temperament. The [[period]] is half an [[octave]], and the generator ~21/20, with generator tunings of [[130edo|9\130]] or [[202edo|14\202]] being good choices. [[Mos]] of size 14, 16, 30, 44 or 58 are among the scale choices.


It becomes much more interesting as we move to the 11-limit, where we can add [[243/242]], [[441/440]] and [[540/539]] to the set of commas. 9\130 and especially 14\202 still make for good tuning choices, and the octave part of the wedgie is {{multival| 12 34 20 30 … }}.
It becomes much more interesting as we move to the 11-limit, where we can add [[243/242]], [[441/440]] and [[540/539]] to the set of commas. 9\130 and especially 14\202 still make for good tuning choices.


Similar comments apply to the 13-limit, where we can add [[351/350]], [[364/363]], and [[729/728]] to the commas, with {{multival| 12 34 20 30 52 … }} as the octave wedgie. 130edo is again a good tuning choice, but even better might be tuning the harmonic 7 justly, which can be done via a generator of 83.1174 [[cent]]s. 72 notes of harry gives plenty of room even for the 13-limit harmonies.
Similar comments apply to the 13-limit, where we can add [[351/350]], [[364/363]], and [[729/728]] to the commas. 130edo is again a good tuning choice, but even better might be tuning the harmonic 7 justly, which can be done via a generator of 83.1174 [[cent]]s. 72 notes of harry gives plenty of room even for the 13-limit harmonies.


[[Subgroup]]: 2.3.5.7
[[Subgroup]]: 2.3.5.7
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[[Comma list]]: 2401/2400, 19683/19600
[[Comma list]]: 2401/2400, 19683/19600


[[Mapping]]: [{{val| 2 4 7 7 }}, {{val| 0 -6 -17 -10 }}]
{{Mapping|legend=1| 2 4 7 7 | 0 -6 -17 -10 }}
 
Mapping generators: ~567/400, ~21/20


{{Multival|legend=1| 12 34 20 26 -2 -49 }}
: mapping generators: ~567/400, ~21/20


[[Optimal tuning]] ([[POTE]]): ~567/400 = 1\2, ~27/20 = 516.844 (~21/20 = 83.156)
[[Optimal tuning]] ([[POTE]]): ~567/400 = 1\2, ~27/20 = 516.844 (~21/20 = 83.156)
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Comma list: 243/242, 441/440, 4000/3993
Comma list: 243/242, 441/440, 4000/3993


Mapping: [{{val| 2 4 7 7 9 }}, {{val| 0 -6 -17 -10 -15 }}]
Mapping: {{mapping| 2 4 7 7 9 | 0 -6 -17 -10 -15 }}


Optimal tuning (POTE): ~99/70 = 1\2, ~27/20 = 516.833 (~21/20 = 83.167)
Optimal tuning (POTE): ~99/70 = 1\2, ~27/20 = 516.833 (~21/20 = 83.167)
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Comma list: 243/242, 351/350, 364/363, 441/440
Comma list: 243/242, 351/350, 364/363, 441/440


Mapping: [{{val| 2 4 7 7 9 11 }}, {{val| 0 -6 -17 -10 -15 -26 }}]
Mapping: {{mapping| 2 4 7 7 9 11 | 0 -6 -17 -10 -15 -26 }}


Optimal tuning (POTE): ~55/39 = 1\2, ~27/20 = 516.884 (~21/20 = 83.116)
Optimal tuning (POTE): ~55/39 = 1\2, ~27/20 = 516.884 (~21/20 = 83.116)
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Comma list: 221/220, 243/242, 289/288, 351/350, 441/440
Comma list: 221/220, 243/242, 289/288, 351/350, 441/440


Mapping: [{{val| 2 4 7 7 9 11 9 }}, {{val| 0 -6 -17 -10 -15 -26 -6 }}]
Mapping: {{mapping| 2 4 7 7 9 11 9 | 0 -6 -17 -10 -15 -26 -6 }}


Optimal tuning (POTE): ~17/12 = 1\2, ~27/20 = 516.832 (~21/20 = 83.168)
Optimal tuning (POTE): ~17/12 = 1\2, ~27/20 = 516.832 (~21/20 = 83.168)
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[[Category:Temperament families]]
[[Category:Temperament families]]
[[Category:Gravity]]
[[Category:Pages with mostly numerical content]]
[[Category:Gravity family| ]] <!-- main article -->
[[Category:Gravity family| ]] <!-- main article -->
[[Category:Gravity| ]] <!-- key article -->
[[Category:Rank 2]]
[[Category:Rank 2]]
Retrieved from "https://en.xen.wiki/w/Gravity_family"