15th-octave temperaments: Difference between revisions

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-{{Fractional-octave navigation|15}}
+{{Infobox fractional-octave|15}}
+[[15edo]] has some close approximations including [[22/21]] to one step and [[77/64]] to four steps.
+Temperaments discussed elsewhere include [[Cloudy clan #Pentadecal|pentadecal]] and [[Landscape microtemperaments#Slendscape|slendscape]].
+== Pentadecoid ==
+In pentadecoid, the period (1\15) is given an interpretation of [[22/21]], and four of them represent the keenanismic minor third, [[77/64]] = ([[147/128]])⋅([[22/21]]). The temperament is named for an analog of its relating temperaments, [[decoid]] ({{nowrap| 130 & 140 }}) and [[quintosec family #triacontoid|triacontoid]] ({{nowrap| 120 & 150 }}). Triacontoid is a weak extension of pentadecoid, as well as [[Landscape microtemperaments|slendscape]] ({{nowrap| 255 & 270 }}).
+[[Subgroup]]: 2.3.7.11
+[[Comma list]]: 1362944/1361367, 1771561/1769472
+{{Mapping|legend=1| 15 108 0 94 | 0 -2 1 -1 }}
+: mapping generators: ~22/21, ~7
+[[Optimal tuning]] ([[CTE]]): ~22/21 = 80.0000, ~8/7 = 231.0071 (~1029/1024 = 8.9929)
+{{Optimal ET sequence|legend=1| 120, 135, 660, 795, 930, 1065, 1200, 1335, 2535e }}
+[[Badness]] (Sintel): 0.951
+== Phosphorus ==
+[[Subgroup]]: 2.3.5.7
+[[Comma list]]: 250047/250000, {{monzo| 60 -96 1 32 }}
+[[Mapping]]: {{mapping| 15 8 -4 -4 | 0 13 32 38 }}
+: mapping generators: ~{{monzo| -21 34 4 -15 }}, ~210827008/199290375
+[[Optimal tuning]] ([[CTE]]): ~{{monzo|-21 34 4 -15}} = 80.0000, ~28/27 = 62.9267
+{{Optimal ET sequence|legend=1| 1125, 1335, 2460 }}
+[[Badness]]: 0.381587
 == Quindecic ==
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 {{Optimal ET sequence|legend=1| 15, 30 }}
-[[Badness]] (Smith): 0.028944
+[[Badness]]: 0.028944
 {{Fractional-octave footer}}