118edo: Difference between revisions

Theory: +octave stretch; note prime factorization
 
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== Theory ==
== Theory ==
118edo represents the intersection of the [[5-limit]] [[schismatic]] and [[parakleismic]] temperaments, [[tempering out]] both the [[schisma]], {{monzo| -15 8 1 }} and the [[parakleisma]], {{monzo| 8 14 -13 }}, as well as the [[vishnuzma]], {{monzo| 23 6 -14 }}, the [[hemithirds comma]], {{monzo| 38 -2 -15 }}, and the [[kwazy comma]], {{monzo| -53 10 16 }}. It is the first 5-limit equal division which clearly gives microtempering, with errors well under half a cent. As a result, 118edo also excellently approximates the 22 Shruti scale.
118edo is the first [[5-limit]] equal division which clearly gives [[microtemperament|microtempering]], with [[error]]s well under half a cent. It represents the intersection of the [[5-limit]] [[schismatic]] and [[parakleismic]] temperaments, [[tempering out]] both the [[schisma]], {{monzo| -15 8 1 }} and the [[parakleisma]], {{monzo| 8 14 -13 }}, as well as the [[vishnuzma]], {{monzo| 23 6 -14 }}, the [[hemithirds comma]], {{monzo| 38 -2 -15 }}, and the [[kwazy comma]], {{monzo| -53 10 16 }}.


118edo is the 17th [[The Riemann zeta function and tuning|zeta peak edo]], and it has decent approximations to harmonics [[7/1|7]], [[11/1|11]], [[17/1|17]], and [[19/1|19]]. In the 7-limit, it is particularly notable for tempering out the [[gamelisma]], 1029/1024, and is an excellent tuning for the rank-3 [[Gamelismic family|gamelismic]] temperament, and for [[guiron]], the rank-2 temperament also tempering out the schisma, 32805/32768. It also tempers out 3136/3125, the [[hemimean comma]], but [[99edo]] does better with that.
118edo is the 17th [[zeta peak edo]], and it has decent approximations to harmonics [[7/1|7]], [[11/1|11]], [[17/1|17]], and [[19/1|19]]. In the 7-limit, it is particularly notable for tempering out the [[gamelisma]], 1029/1024, and is an excellent tuning for the rank-3 [[Gamelismic family|gamelismic]] temperament, and for [[guiron]], the rank-2 temperament also tempering out the schisma, 32805/32768. It also tempers out 3136/3125, the [[hemimean comma]], but [[99edo]] does better with that.


In the 11-limit, it tempers out [[385/384]] and [[441/440]], and is an excellent tuning for [[portent]], the temperament tempering out both, and for the 11-limit version of guiron, which does also.
In the 11-limit, it tempers out [[385/384]] and [[441/440]], and is an excellent tuning for [[portent]], the temperament tempering out both, and for the 11-limit version of guiron, which does also.
Line 353: Line 353:
| 355.93
| 355.93
|  
|  
| [[27/22]], 16/13 I**
| [[27/22]], [[16/13]] I**
| Minor tridecimal neurtral third, "major-neutral" third
| Minor tridecimal neutral third, "major-neutral" third
| bromine
| bromine
| {{UDnote|step=35}}
| {{UDnote|step=35}}
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|  
|  
| [[15/11]]
| [[15/11]]
|
| iodine
| {{UDnote|step=53}}
| {{UDnote|step=53}}
|
| iodine
| OG, uGb
| OG, uGb
|-
|-
Line 525: Line 525:
|  
|  
| [[48/35]], [[11/8]]
| [[48/35]], [[11/8]]
|
| xenon
| {{UDnote|step=54}}
| {{UDnote|step=54}}
|
| xenon
| UG, oAb
| UG, oAb
|-
|-
Line 1,152: Line 1,152:
|-
|-
| 2.3
| 2.3
| {{monzo| -187 118 }}
| {{Monzo| -187 118 }}
| {{mapping| 118 187 }}
| {{Mapping| 118 187 }}
| −0.119
| −0.119
| 0.082
| 0.082
| 0.81
| 0.81
Line 1,160: Line 1,160:
| 2.3.5
| 2.3.5
| 32805/32768, {{monzo| 8 14 -13 }}
| 32805/32768, {{monzo| 8 14 -13 }}
| {{mapping| 118 187 274 }}
| {{Mapping| 118 187 274 }}
| +0.036
| +0.036
| 0.093
| 0.093
Line 1,167: Line 1,167:
| 2.3.5.7
| 2.3.5.7
| 1029/1024, 3136/3125, 4375/4374
| 1029/1024, 3136/3125, 4375/4374
| {{mapping| 118 187 274 331 }}
| {{Mapping| 118 187 274 331 }}
| +0.270
| +0.270
| 0.412
| 0.412
Line 1,174: Line 1,174:
| 2.3.5.7.11
| 2.3.5.7.11
| 385/384, 441/440, 3136/3125, 4375/4374
| 385/384, 441/440, 3136/3125, 4375/4374
| {{mapping| 118 187 274 331 408 }}
| {{Mapping| 118 187 274 331 408 }}
| +0.341
| +0.341
| 0.370
| 0.370
Line 1,181: Line 1,181:
| 2.3.5.7.11.13
| 2.3.5.7.11.13
| 196/195, 352/351, 384/384, 625/624, 729/728
| 196/195, 352/351, 384/384, 625/624, 729/728
| {{mapping| 118 187 274 331 408 437 }} (118)
| {{Mapping| 118 187 274 331 408 437 }} (118)
| +0.125
| +0.125
| 0.604
| 0.604
Line 1,188: Line 1,188:
| 2.3.5.7.11.13
| 2.3.5.7.11.13
| 169/168, 325/324, 364/363, 385/384, 3136/3125
| 169/168, 325/324, 364/363, 385/384, 3136/3125
| {{mapping| 118 187 274 331 408 436 }} (118f)
| {{Mapping| 118 187 274 331 408 436 }} (118f)
| +0.583
| +0.583
| 0.650
| 0.650
Line 1,195: Line 1,195:
| 2.3.5.7.11.17
| 2.3.5.7.11.17
| 289/288, 385/384, 441/440, 561/560, 3136/3125
| 289/288, 385/384, 441/440, 561/560, 3136/3125
| {{mapping| 118 187 274 331 408 482 }}
| {{Mapping| 118 187 274 331 408 482 }}
| +0.417
| +0.417
| 0.399
| 0.399
Line 1,202: Line 1,202:
| 2.3.5.7.11.17.19
| 2.3.5.7.11.17.19
| 289/288, 361/360, 385/384, 441/440, 476/475, 513/512, 969/968
| 289/288, 361/360, 385/384, 441/440, 476/475, 513/512, 969/968
| {{mapping| 118 187 274 331 408 482 501 }}
| {{Mapping| 118 187 274 331 408 482 501 }}
| +0.445
| +0.445
| 0.376
| 0.376
Line 1,229: Line 1,229:
| 193.22
| 193.22
| 28/25
| 28/25
| [[Luna]] / [[hemithirds]] / [[lunatic]]
| [[Hemithirds]] / [[lunatic]]
|-
|-
| 1
| 1
Line 1,235: Line 1,235:
| 233.90
| 233.90
| 8/7
| 8/7
| [[Slendric]] / [[guiron]]
| [[Guiron]]
|-
|-
| 1
| 1
Line 1,241: Line 1,241:
| 315.25
| 315.25
| 6/5
| 6/5
| [[Parakleismic]] / paralytic
| [[Parakleismic]] / [[counterpara]]
|-
|-
| 1
| 1
Line 1,253: Line 1,253:
| 498.31
| 498.31
| 4/3
| 4/3
| [[Helmholtz]] / [[pontiac]] / helenoid / pontic
| [[Pontiac]] / helenoid / pontic
|-
|-
| 1
| 1
Line 1,277: Line 1,277:
| 71.19
| 71.19
| 25/24
| 25/24
| [[Vishnu]] / ananta (118) / acyuta (118f)
| [[Vishnu]] / [[narayana]]
|-
|-
| 2
| 2
Line 1,289: Line 1,289:
| 162.71
| 162.71
| 11/10
| 11/10
| [[Kwazy]] / [[bisupermajor]]
| [[Bisupermajor]]
|-
|-
| 2
| 2
Line 1,304: Line 1,304:
|-
|-
| 2
| 2
| 31\118<br>(28\118)
| 28\118
| 315.25<br>(284.75)
| 284.75
| 6/5<br>(33/28)
| 33/28
| [[Semiparakleismic]]
| [[Semiparakleismic]]
|}
|}
<nowiki/>* [[Normal lists|Octave-reduced form]], reduced to the first half-octave, and [[Normal lists|minimal form]] in parentheses if distinct
<nowiki/>* In [[normal forms #Minimal-generator form|minimal-generator form]]


== Instruments ==
== Instruments ==