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== Theory ==
== Theory ==
270edo is an extremely strong [[13-limit]] and system, [[distinctly consistent]] through the [[15-odd-limit]] and almost [[Consistency#Consistency to distance d|consistent to distance 2]] in it, missing [[15/13]] and [[26/15]] as they have 25.8% error ([[tempering out]] [[676/675]]). This results in it being a record edo for [[Pepper ambiguity]] in the 11-, 13- and 15-odd-limit, and the edo with the lowest [[TE logflat badness]] in the 11-limit ''and'' 13-limit up until [[342edo]] and [[96478edo]] respectively.  
270edo is an extremely strong [[13-limit]] system, [[distinctly consistent]] through the [[15-odd-limit]] and almost [[Consistency #Consistency to distance d|consistent to distance 2]] in it, missing [[15/13]] and [[26/15]] as they have 25.8% error ([[tempering out]] [[676/675]], [[CWE tuning|CWE]] yields only 0.4% error from 270edo for both intervals). It is the 11th [[zeta gap edo]], the 13th [[zeta integral edo]], the 23rd [[zeta peak edo]], and the 18th [[zeta peak integer edo]], making it a [[strict zeta edo]].   
 
It is [[The Riemann zeta function and tuning #Zeta EDO lists|the 11th zeta gap edo, the 13th zeta integral edo, the 23rd zeta peak edo, and the 18th zeta peak integer edo]], making it a [[strict zeta edo]].   


In the [[5-limit]] it tempers out the [[ennealimma]], {{monzo| 1 -27 18 }}, the [[vulture comma]], {{monzo| 24 -21 4 }}, and the [[vishnuzma]], {{monzo| 23 6 -14 }}.  
In the [[5-limit]] it tempers out the [[ennealimma]], {{monzo| 1 -27 18 }}, the [[vulture comma]], {{monzo| 24 -21 4 }}, and the [[vishnuzma]], {{monzo| 23 6 -14 }}.  


In the [[7-limit]] it tempers out the [[2401/2400|breedsma]] (2401/2400), the [[4375/4374|ragisma]] (4375/4374), and by extension the [[wizma]] (420175/419904), and the [[landscape comma]] (250047/250000) so that it [[support]]s [[ennealimmal]] temperament. It also tempers out the [[quasiorwellisma]] (29360128/29296875) and the [[garischisma]] (33554432/33480783).  
In the [[7-limit]] it tempers out the [[breedsma]] (2401/2400), the [[ragisma]] (4375/4374), and by extension the [[wizma]] (420175/419904), and the [[landscape comma]] (250047/250000) so that it [[support]]s [[ennealimmal]] temperament. It also tempers out the [[quasiorwellisma]] (29360128/29296875) and the [[septischisma]] (33554432/33480783).  


In the [[11-limit]], it tempers out the lehmerisma ([[3025/3024]]), the vishdel comma ([[5632/5625]]), the kalisma ([[9801/9800]]), the [[symbiotic comma]] (19712/19683), the [[nexus comma]] (1771561/1769472), and the [[quartisma]] (117440512/117406179). Notably, it is consistent to distance 3 in the [[11-odd-limit]], and almost to distance 4 ((11/10)<sup>4</sup> and (20/11)<sup>4</sup> are a hair off, 50.4%).
In the [[11-limit]], it tempers out the [[lehmerisma]] (3025/3024), the [[vishdelisma]] (5632/5625), the [[kalisma]] (9801/9800), the [[symbiotic comma]] (19712/19683), the [[nexus comma]] (1771561/1769472), and the [[quartisma]] (117440512/117406179). It is almost consistent to distance 3 in the [[11-odd-limit]], only barely missing [[11/9]] (off by 16.68%).  


Finally, in the [[13-limit]] it is slightly worse but still excellent. It tempers out [[676/675]], [[1001/1000]], [[1716/1715]], and [[2080/2079]], making it an [[The Archipelago|archipelago]] tuning, and the [[optimal patent val]] for some of the archipelago temperaments such as [[hemiennealimmal]], [[vulture]], [[eagle]], and [[avicenna (temperament)|avicenna]].   
Finally, in the [[13-limit]] it is slightly worse but still excellent. It tempers out [[676/675]], [[1001/1000]], [[1716/1715]], and [[2080/2079]], making it an [[The Archipelago|archipelago]] tuning, and the [[optimal patent val]] for some of the archipelago temperaments such as [[hemiennealimmal]], [[vulture]], [[eagle]], and [[avicenna (temperament)|avicenna]].   
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The excellent tuning accuracy does not bar it from the utility of [[essentially tempered chord]]s, including [[sinbadmic chords]] in the 13-odd-limit, and [[island chords]] in the 15-odd-limit.  
The excellent tuning accuracy does not bar it from the utility of [[essentially tempered chord]]s, including [[sinbadmic chords]] in the 13-odd-limit, and [[island chords]] in the 15-odd-limit.  


Beyond the 13-limit, the approximated [[17/1|harmonic 17]] is more than 1/3-edostep, but the [[19/1|harmonic 19]] is extremely accurately tuned. [[17/13]] and its [[octave complement]] [[26/17]] are the only inconsistently approximated [[21-odd-limit]] intervals, each barely missing the mark (50.4% relative error). The [[23/1|harmonic 23]] is more than 1/3-edostep flat, which incurs more inconsistencies in the next odd limits yet makes 270edo viable but tricky for the full [[23-limit]]. It tempers out [[715/714]], [[936/935]], [[1089/1088]], [[1225/1224]], [[1701/1700]], [[2025/2023]], [[2058/2057]], and [[2431/2430]] in the [[17-limit]]; [[1216/1215]], [[1331/1330]], [[1521/1520]], [[1540/1539]], and [[1729/1728]] in the [[19-limit]]. If the full 23-limit is desired, then [[460/459]], [[529/528]], [[736/735]], [[897/896]], [[1288/1287]], 1311/1309, and 1771/1768 are further tempered out.  
Beyond the 13-limit, the approximated [[17/1|harmonic 17]] is more than 1/3-edostep, but the [[19/1|harmonic 19]] is very accurately tuned. [[17/13]] and its [[octave complement]] [[26/17]] are the only inconsistently approximated [[21-odd-limit]] intervals, each barely missing the mark (50.4% relative error). The [[23/1|harmonic 23]] is more than 1/3-edostep flat, which incurs more inconsistencies in the next odd limits yet makes 270edo viable but tricky for the full [[23-limit]]. It tempers out [[715/714]], [[936/935]], [[1089/1088]], [[1225/1224]], [[1701/1700]], [[2025/2023]], [[2058/2057]], and [[2431/2430]] in the [[17-limit]]; [[1216/1215]], [[1331/1330]], [[1521/1520]], [[1540/1539]], and [[1729/1728]] in the [[19-limit]]. If the full 23-limit is desired, then [[460/459]], [[529/528]], [[736/735]], [[897/896]], [[1288/1287]], 1311/1309, and 1771/1768 are further tempered out.  


The harmonics [[29/1|29]] and [[31/1|31]] are also more than 1/3-edostep sharp, but not as sharp as the 17 to incur inconsistency ([[29/26]] and [[31/26]] are critically sharp but still consistent). This makes 270edo consistent in the no-17/13 no-23 [[35-odd-limit]]. Notably, it tempers out [[784/783]], [[900/899]], and [[1024/1023]], while inflating [[841/840]] and [[961/960]].  
The harmonics [[29/1|29]] and [[31/1|31]] are also more than 1/3-edostep sharp, but not as sharp as the 17 to incur inconsistency ([[29/26]] and [[31/26]] are critically sharp but still consistent). This makes 270edo consistent in the no-17/13 no-23 [[35-odd-limit]]. Notably, it tempers out [[784/783]], [[900/899]], and [[1024/1023]], while inflating [[841/840]] and [[961/960]].  
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== Notation ==
== Notation ==
=== Ups and downs notation ===
=== Ups and downs notation ===
270edo can be notated using [[Kite's ups and downs notation|ups and downs]] with Stein-Zimmerman quarter-tone accidentals representing half-apotomes:
270edo can be notated using [[Kite's ups and downs notation|ups and downs]] with Stein-Zimmerman quarter-tone accidentals representing half-sharps and half-flats. These can be spoken as ''sha'' and ''fla''. For example, the note 12\270 above C is C downsha, and the note 39\270 above C is C shasharp.
{{Ups and downs sharpness|270|true}}
{{Ups and downs sharpness|270|true}}


=== Sagittal notation ===
=== Sagittal notation ===
<span data-darkreader-inline-color="">The</span> [[Sagittal notation]] <span data-darkreader-inline-color="">for 270edo uses alterations of the Promethian set. Since the apotome can be split in two, a SZ half-sharp and a half-flat may be used.</span>  
<span data-darkreader-inline-color="">The</span> [[Sagittal notation]] <span data-darkreader-inline-color="">for 270edo uses symbols from the Promethean set. Since the apotome can be split in two, the Stein-Zimmermann half-sharp and half-flat may be used.</span>  
{| class="wikitable center-all" data-darkreader-inline-color=""
{| class="wikitable center-all" data-darkreader-inline-color=""
! colspan="2" |+ edosteps
! colspan="2" |+ edosteps
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|-
|-
! rowspan="3" |Symbol
! rowspan="3" |Symbol
!SZ
!Evo-SZ
| rowspan="3" |<big>{{sagittal||(}}</big>
| rowspan="3" |<big>{{sagittal||(}}</big>
| rowspan="3" |<big>{{sagittal|)|(}}</big>
| rowspan="3" |<big>{{sagittal|)|(}}</big>
| rowspan="3" |<big>{{sagittal|)~|}}</big>
| rowspan="3" |<big>{{Sagittal|~|(}}</big>
| rowspan="3" |<big>{{Sagittal|~|(}}</big>
| rowspan="3" |<big>{{Sagittal|~~|}}</big>
| rowspan="3" |<big>{{Sagittal|/|}}</big>
| rowspan="3" |<big>{{Sagittal|/|}}</big>
| rowspan="3" |<big>{{Sagittal||)}}</big>
| rowspan="3" |<big>{{Sagittal||)}}</big>
| rowspan="3" |<big>{{sagittal||\}}</big>
| rowspan="3" |<big>{{sagittal||\}}</big>
| rowspan="3" |<big>{{sagittal|(|}}</big>
| rowspan="3" |<big>{{sagittal|~|)}}</big>
| rowspan="3" |<big>{{sagittal|(|(}}</big>
| rowspan="3" |<big>{{sagittal|(|(}}</big>
| rowspan="3" |<big>{{sagittal|//|}}</big>
| rowspan="3" |<big>{{sagittal|//|}}</big>
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| rowspan="3" |<big>{{Sagittal|/|\}}</big>
| rowspan="3" |<big>{{Sagittal|/|\}}</big>
|<big>{{Sagittal|t}}</big>
|<big>{{Sagittal|t}}</big>
|<small>{{Sagittal||(}}{{sagittal|t}}</small>
|{{Sagittal||(}}{{sagittal|t}}
|<small>{{Sagittal|)|(}}{{sagittal|t}}</small>
|{{Sagittal|)|(}}{{sagittal|t}}
|<small>{{Sagittal|)~|}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|\\!}}{{sagittal|#}}
|<small>{{Sagittal|~|(}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|(!(}}{{sagittal|#}}
|<small>{{Sagittal|/|}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|~!)}}{{sagittal|#}}
|<small>{{Sagittal||)}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|!/}}{{sagittal|#}}
|<small>{{Sagittal||\}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|!)}}{{sagittal|#}}
|<small>{{Sagittal|(|}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|\!}}{{sagittal|#}}
|<small>{{Sagittal|(|(}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|~~!}}{{sagittal|#}}
|<small>{{Sagittal|//|}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|~!(}}{{sagittal|#}}
|<small>{{Sagittal|/|)}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|)!(}}{{sagittal|#}}
|<small>{{Sagittal|/|\}}{{sagittal|t}}</small>
| rowspan="2" |{{sagittal|!(}}{{sagittal|#}}
| rowspan="2" |<big>{{Sagittal|#}}</big>
| rowspan="2" |<big>{{Sagittal|#}}</big>
|-
|-
!Evo
!Evo
| rowspan="2" |<big>{{sagittal|)/|\}}</big>
| rowspan="2" |<big>{{sagittal|)/|\}}</big>
|<small>{{sagittal|\!/}}{{sagittal|#}}</small>
| rowspan="2" |<big>{{Sagittal|(|)}}</big>
|<small>{{sagittal|\!)}}{{sagittal|#}}</small>
| rowspan="2" |<big>{{sagittal|(|\}}</big>
|<small>{{sagittal|\\!}}{{sagittal|#}}</small>
|<small>{{sagittal|(!(}}{{sagittal|#}}</small>
|<small>{{sagittal|(!}}{{sagittal|#}}</small>
|<small>{{sagittal|!/}}{{sagittal|#}}</small>
|<small>{{sagittal|!)}}{{sagittal|#}}</small>
|<small>{{sagittal|\!}}{{sagittal|#}}</small>
|<small>{{sagittal|~!(}}{{sagittal|#}}</small>
|<small>{{sagittal|)~!}}{{sagittal|#}}</small>
|<small>{{sagittal|)!(}}{{sagittal|#}}</small>
|<small>{{sagittal|!(}}{{sagittal|#}}</small>
|-
|-
!Revo
!Revo
|<big>{{Sagittal|(|)}}</big>
|<big>{{sagittal|(|\}}</big>
|<big>{{sagittal|)||(}}</big>
|<big>{{sagittal|)||(}}</big>
|<big>{{sagittal|~||(}}</big>
|<big>{{sagittal|~||(}}</big>
Line 126: Line 112:
|<big>{{Sagittal|||)}}</big>
|<big>{{Sagittal|||)}}</big>
|<big>{{Sagittal|||\}}</big>
|<big>{{Sagittal|||\}}</big>
|<big>{{sagittal|~||)}}</big>
|<big>{{sagittal|(||(}}</big>
|<big>{{sagittal|(||(}}</big>
|<big>{{sagittal|~||\}}</big>
|<big>{{sagittal|//||}}</big>
|<big>{{sagittal|//||}}</big>
|<big>{{sagittal|/||)}}</big>
|<big>{{sagittal|/||)}}</big>
|<big>{{Sagittal|/||\}}</big>
|<big>{{Sagittal|/||\}}</big>
|}
|}
Note that the Revo notation has matching flag sequences between the double-shaft symbols and a subsequence of the single-shaft symbols.
<span data-darkreader-inline-color="">Alternate spellings in the Promethean set (comma tempered out):</span>  
<span data-darkreader-inline-color="">Alternate spellings in the Promethean set (comma tempered out):</span>  


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| 4.58
| 4.58
|}
|}
* 270et has lower [[Tenney-Euclidean temperament measures #TE simple badness|relative errors]] than any previous equal temperaments in the 11-, 13-, 19-, and 23-limit. It is the first to beat [[72edo|72]] in the 11-limit, [[224edo|224]] in the 13-limit, and [[217edo|217]] in the 19- and 23-limit. The next equal temperament that has lower absolute or relative error in the 11-limit is [[342edo|342]], in the 13-limit [[494edo|494]], in the 23-limit [[282edo|282]]; and in the 19-limit, [[311edo|311]] for absolute error and [[581edo|581]] for relative error.  
* 270et has lower [[Tenney-Euclidean temperament measures #TE simple badness|relative errors]] than any previous equal temperaments in the 11-, 13-, 19-, and 23-limit. It is the first to beat [[72edo|72]] in the 11-limit, [[224edo|224]] in the 13-limit, and [[217edo|217]] in the 19- and 23-limit. The next equal temperament that has lower absolute or relative error in the 11-limit is [[342edo|342]], in the 13-limit [[494edo|494]], in the 23-limit [[282edo|282]]; and in the 19-limit, [[311edo|311]] for absolute error and [[581edo|581]] for relative error. It is also a record edo for [[Pepper ambiguity]] in the 11-, 13- and 15-odd-limit, and the edo with the lowest [[TE logflat badness]] in the 11-limit, 13-limit and 19-limit up until [[342edo]], [[96478edo]] and [[3395edo]] respectively.  
* 23-limit is not the subgroup it does best, with the no-23 29- and 31-limit approximated even better.  
* 23-limit is not the subgroup it does best, with the no-23 29- and 31-limit approximated even better.  
* It is best in the 2.3.5.7.11.13.19 subgroup, having the least absolute error until [[552edo|552]], and the least relative error until [[2190edo|2190]].
* It is best in the 2.3.5.7.11.13.19 subgroup, having the least absolute error until [[552edo|552]], and the least relative error until [[2190edo|2190]].
Line 246: Line 234:
|-
|-
| 5
| 5
| [[Vishnuzma|(20 digits)]]
| [[Vishnu comma|(20 digits)]]
| 3.34
| 3.34
| {{Monzo| 23 6 -14 }}
| {{Monzo| 23 6 -14 }}
| Sasepbigu
| Sasepbigu
| sg<sup>14</sup>
| sg<sup>14</sup>
| Vishnuzma
| Vishnu comma
|-
|-
| 7
| 7
Line 259: Line 247:
| Sasaru
| Sasaru
| ssr
| ssr
| Garischisma
| Septischisma
|-
| 7
| [[Quasiorwellisma|(16 digits)]]
| 3.73
| {{Monzo| 22 -1 -10 1 }}
| Sazoquinbigu
| szg<sup>10</sup>
| Quasiorwellisma
|-
|-
| 7
| 7
Line 276: Line 272:
| zy<sup>4</sup>
| zy<sup>4</sup>
| Ragisma
| Ragisma
|-
| 7
| [[Quasiorwellisma|(16 digits)]]
| 3.73
| {{Monzo| 22 -1 -10 1 }}
| Sazoquinbigu
| szg<sup>10</sup>
| Quasiorwellisma
|-
|-
| 11
| 11
Line 299: Line 287:
| Saloquagu
| Saloquagu
| s1og<sup>4</sup>
| s1og<sup>4</sup>
| Vishdel comma
| Vishdelisma
|-
|-
| 11
| 11
Line 357: Line 345:
| Minisma
| Minisma
|-
|-
|17
| 17
| [[12376/12375]]
| [[12376/12375]]
| 0.14
| 0.14
Line 373: Line 361:
| Password, Eratosthenes' comma
| Password, Eratosthenes' comma
|-
|-
|19
| 19
|[[11859211/11859210|(16 digits)]]
| [[11859211/11859210|(16 digits)]]
|0.00
| 0.00
|{{Monzo|-1 -4 -1 1 -4 1 0 4}}
| {{Monzo| -1 -4 -1 1 -4 1 0 4 }}
|<small>Quadno-athoquadlu-azogu</small>
| <small>Quadno-athoquadlu-azogu</small>
|<small>9o<sup>4</sup>3o1u<sup>4</sup>zg</small>
| <small>9o<sup>4</sup>3o1u<sup>4</sup>zg</small>
|Tredekisma
| Tredekisma
|-
|-
| 23
| 23
Line 458: Line 446:
| 25/19
| 25/19
| [[Vulture]]
| [[Vulture]]
|-
| 2
| 4\270
| 17.{{overline|7}}
| 99/98
| [[Quarvish]]
|-
|-
| 2
| 2
Line 469: Line 463:
| 71.{{overline|1}}
| 71.{{overline|1}}
| 25/24
| 25/24
| [[Vishnu]] / ananta / acyuta
| [[Vishnu]] / acyuta / ananta
|-
|-
| 2
| 2
| 112\270<br>(23\270)
| 23\270
| 497.{{overline|7}}<br>(102.{{overline|2}})
| 102.{{overline|2}}
| 4/3<br>(35/33)
| 35/33
| [[Gariwizmic]]
| [[Gariwizmic]]
|-
|-
Line 494: Line 488:
| 8/7
| 8/7
| [[Orga]]
| [[Orga]]
|-
| 2
| 131\270<br>(4\270)
| 582.{{overline|2}}<br>(17.{{overline|7}})
| 7/5<br>(99/98)
| [[Quarvish]]
|-
|-
| 3
| 3
Line 514: Line 502:
|-
|-
| 5
| 5
| 83\270<br>(25\270)
| 25\270
| 368.{{overline|8}}<br>(111.{{overline|1}})
| 111.{{overline|1}}
| 1024/891<br>(16/15)
| 16/15
| [[Quintosec]]
| [[Quintosec]]
|-
|-
| 6
| 6
| 112\270<br>(4\270)
| 16\270
| 497.{{overline|7}}<br>(97.{{overline|7}})
| 71.{{overline|1}}
| 4/3<br>(128/121)
| 25/24
| [[Trivish]]
|-
| 6
| 22\270
| 97.{{overline|7}}
| 128/121
| [[Sextile]]
| [[Sextile]]
|-
|-
| 9
| 9
| 71\270<br>(11\270)
| 11\270
| 315.{{overline|5}}<br>(48.{{overline|8}})
| 48.{{overline|8}}
| 6/5<br>(36/35)
| 36/35
| [[Ennealimmal]] / ennealimmia
| [[Ennealimmal]] / enneabiotic / ennealympic
|-
|-
| 10
| 10
| 16\270<br>(11\270)
| 2\270
| 71.{{overline|1}}<br>(48.{{overline|8}})
| 8.{{overline|8}}
| 25/24<br>(36/35)
| 196/195
| [[Decavish]]
| [[Decoid]]
|-
|-
| 10
| 10
| 56\270<br>(2\270)
| 10\270
| 248.{{overline|8}}<br>(8.{{overline|8}})
| 44.{{overline|4}}
| 15/13<br>(176/175)
| 40/39
| [[Decoid]]
| [[Deca]]
|-
|-
| 10
| 10
| 71\270<br>(10\270)
| 11\270
| 315.{{overline|5}}<br>(44.{{overline|4}})
| 48.{{overline|8}}
| 6/5<br>(40/39)
| 36/35
| [[Deca]]
| [[Decavish]]
|-
|-
| 18
| 18
| 71\270<br>(4\270)
| 2\270
| 248.{{overline|8}}<br>(17.{{overline|7}})
| 8.{{overline|8}}
| 15/13<br>(99/98)
| 1287/1280
| [[Hemiennealimmal]]
| [[Semihemiennealimmal]]
|-
|-
| 18
| 18
| 71\270<br>(2\270)
| 4\270
| 475.{{overline|5}}<br>(8.{{overline|8}})
| 17.{{overline|7}}
| 1053/800<br>(1287/1280)
| 99/98
| [[Semihemiennealimmal]]
| [[Hemiennealimmal]]
|-
|-
| 27
| 27
| 61\270<br>(1\270)
| 1\270
| 271.{{overline|1}}<br>(4.{{overline|4}})
| 4.{{overline|4}}
| 1375/1176<br>(385/384)
| 385/384
| [[Trinealimmal]]
| [[Trinealimmal]]
|-
|-
| 30
| 30
| 82\270<br>(1\270)
| 1\270
| 364.{{overline|4}}<br>(4.{{overline|4}})
| 4.{{overline|4}}
| 216/175<br>(385/384)
| 385/384
| [[Zinc]]
| [[Zinc]]
|-
| 30
| 2\270
| 8.{{overline|8}}
| 196/195
| [[Triacontoid]]
|-
|-
| 45
| 45
| 59\270<br>(1\270)
| 1\270
| 262.{{overline|2}}<br>(4.{{overline|4}})
| 4.{{overline|4}}
| 64/55<br>(385/384)
| 385/384
| [[Rhodium]]
| [[Rhodium]]
|}
|}
<nowiki/>* [[Normal forms #Equave-reduced-generator form|Octave-reduced form]], reduced to the first half-octave, and [[normal forms #Minimal-generator form|minimal form]] in parentheses if distinct
<nowiki/>* In [[normal forms #Minimal-generator form|minimal-generator form]]


== Scales ==
== Scales ==
=== Mos scales ===
=== [[MOS]] scales ===
* [[Ennealimmal]][45]: 2 12 2 12 2 2 12 2 12 2 2 12 2 12 2 2 12 2 12 2 2 12 2 12 2 2 12 2 12 2 2 12 2 12 2 2 12 2 12 2 2 12 2 12 2
* [[Abigail]][86]: 5 1 5 1 5 1 5 1 5 1 5 1 5 1 5 5 1 5 1 5 1 5 1 5 1 5 1 5 5 1 5 1 5 1 5 1 5 1 5 1 5 1 5 5 1 5 1 5 1 5 1 5 1 5 1 5 1 5 5 1 5 1 5 1 5 1 5 1 5 1 5 5 1 5 1 5 1 5 1 5 1 5 1 5 1 5
* [[Avicenna]][96]: 3 3 3 3 3 1 3 3 3 3 3 3 3 3 3 1 3 3 3 3 3 3 3 3 3 3 1 3 3 3 3 3 3 3 3 3 3 1 3 3 3 3 3 3 3 3 3 1 3 3 3 3 3 3 3 3 3 3 1 3 3 3 3 3 3 3 3 3 3 1 3 3 3 3 3 3 3 3 3 1 3 3 3 3 3 3 3 3 3 3 1 3 3 3 3 3
* [[Eagle]][84]: 4 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1 4 4 1 4 1
* [[Ennealimmal]][27]: 11 11 8 11 11 8 11 11 8 11 11 8 11 11 8 11 11 8 11 11 8 11 11 8 11 11 8
* Ennealimmal[45]: 8 3 8 3 8 8 3 8 3 8 8 3 8 3 8 8 3 8 3 8 8 3 8 3 8 8 3 8 3 8 8 3 8 3 8 8 3 8 3 8 8 3 8 3 8
* [[Quasiorwell]][84]: 1 7 1 1 7 1 7 1 1 7 1 1 7 1 7 1 1 7 1 1 7 1 1 7 1 7 1 1 7 1 1 7 1 7 1 1 7 1 1 7 1 1 7 1 7 1 1 7 1 1 7 1 7 1 1 7 1 1 7 1 7 1 1 7 1 1 7 1 1 7 1 7 1 1 7 1 1 7 1 7 1 1 7 1
* [[Quintosec]][25]: 4 21 4 21 4 4 21 4 21 4 4 21 4 21 4 4 21 4 21 4 4 21 4 21 4
* Quintosec[55]: 4 4 9 4 4 4 4 4 9 4 4 4 4 9 4 4 4 4 4 9 4 4 4 4 9 4 4 4 4 4 9 4 4 4 4 9 4 4 4 4 4 9 4 4 4 4 9 4 4 4 4 4 9 4 4
* Quintosec[65]: 4 4 4 5 4 4 4 4 4 5 4 4 4 4 4 4 5 4 4 4 4 4 5 4 4 4 4 4 4 5 4 4 4 4 4 5 4 4 4 4 4 4 5 4 4 4 4 4 5 4 4 4 4 4 4 5 4 4 4 4 4 5 4 4 4
* [[Vishnu]][34]: 7 9 7 9 7 9 7 9 7 9 7 9 7 9 7 9 7 7 9 7 9 7 9 7 9 7 9 7 9 7 9 7 9 7
* [[Vishnu]][34]: 7 9 7 9 7 9 7 9 7 9 7 9 7 9 7 9 7 7 9 7 9 7 9 7 9 7 9 7 9 7 9 7 9 7


=== Harmonic scales ===
=== Harmonic scales ===
270edo very accurately approximates the mode 16 of [[harmonic series]]. The scale in adjacent steps is 24, 22, 21, 20, 19, 18, 17, 17, 16, 15, 15, 14, 14, 13, 13, 12. Four interval pairs are conflated: 23/22~24/23, 26/25~27/26, 28/27~29/28, and 30/29~31/30.  
270edo very accurately approximates mode 16 of the [[harmonic series]]. Only four interval pairs are conflated: 23/22~24/23, 26/25~27/26, 28/27~29/28 and 30/29~31/30. The scale in adjacent steps is:
* 24 22 21 20 19 18 17 17 16 15 15 14 14 13 13 12
 
 
It further does decently in the mode 24. The scale in adjacent steps is:
* 16 15 15 14 14 13 13 12 12 12 11 11 11 10 10 10 10 9 9 9 9 9 8 8


It further does decently in the mode 24. The scale in adjacent steps is 16, 15, 15, 14, 14, 13, 13, 12, 12, 12, 11, 11, 11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 8.
=== [[Historical temperaments|Historical temperament]] approximations ===
* [[Kirnberger III]]: 20 23 23 21 25 21 24 21 22 24 21 25
* [[Septenarius]]: 20 24 23 22 23 22 23 21 23 24 22 23
* [[Vallotti]]: 21 23 23 21 25 20 24 22 22 24 20 25
* [[Werckmeister III]]: 20 23 23 22 24 20 25 21 22 24 22 24


=== Other scales ===
=== Other scales ===
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