28edo: Difference between revisions

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Line 15: Line 15:
{| class="wikitable"
{| class="wikitable"
|-
|-
| style="text-align:center;" | Step #
| rowspan="2" style="text-align:center;" | Step #
| style="text-align:center;" | ET Cents
| colspan="3" style="text-align:center;" | ET
| style="text-align:center;" | Just Interval
| colspan="4" style="text-align:center;" | Just  
| style="text-align:center;" | Just Cents
| style="text-align:center;" | Difference
| style="text-align:center;" | Difference


(ET minus Just)
(ET minus Just)
| colspan="3" style="text-align:center;" | [[Ups_and_Downs_Notation|Up/down ]][[Ups_and_Downs_Notation|Notation]]
| colspan="3" style="text-align:center;" | [[Ups_and_Downs_Notation|Up/down]] [[Ups_and_Downs_Notation|Notation]]
|-
|Cents
|pions
|7mus
|Interval
|Cents
|pions
|7mus
|
|
|
|
|-
|-
| style="text-align:center;" | 0
| style="text-align:center;" | 0
| style="text-align:center;" | 0¢
| style="text-align:center;" | 0¢
|0π<sup>¢</sup>
|0
| style="text-align:center;" |  
| style="text-align:center;" |  
| style="text-align:center;" |  
| style="text-align:center;" |  
|
|
| style="text-align:center;" |  
| style="text-align:center;" |  
| style="text-align:center;" | unison
| style="text-align:center;" | unison
Line 35: Line 50:
| style="text-align:center;" | 1
| style="text-align:center;" | 1
| style="text-align:center;" | 42.86
| style="text-align:center;" | 42.86
|45.43
|54.86 (36.DC<sub>16</sub>)
| style="text-align:center;" |  
| style="text-align:center;" |  
| style="text-align:center;" |  
| style="text-align:center;" |  
|
|
| style="text-align:center;" |  
| style="text-align:center;" |  
| style="text-align:center;" | up-unison
| style="text-align:center;" | up-unison
Line 44: Line 63:
| style="text-align:center;" | 2
| style="text-align:center;" | 2
| style="text-align:center;" | 85.71
| style="text-align:center;" | 85.71
|90.86
|109.71 (6D.B7<sub>16</sub>)
| style="text-align:center;" | 21:20
| style="text-align:center;" | 21:20
| style="text-align:center;" | 84.47
| style="text-align:center;" | 84.47
|89.535
|108.12 (6C.1E<sub>16</sub>)
| style="text-align:center;" | 1.24
| style="text-align:center;" | 1.24
| style="text-align:center;" | double-up, double-down
| style="text-align:center;" | double-up, double-down
Line 53: Line 76:
| style="text-align:center;" | 3
| style="text-align:center;" | 3
| style="text-align:center;" | 128.57
| style="text-align:center;" | 128.57
|136.29
|164.57 (A4.92<sub>16</sub>)
| style="text-align:center;" | 14:13
| style="text-align:center;" | 14:13
| style="text-align:center;" | 128.30
| style="text-align:center;" | 128.3
|136
|164.22 (A4.38<sub>16</sub>)
| style="text-align:center;" | 0.27
| style="text-align:center;" | 0.27
| style="text-align:center;" | down 2nd
| style="text-align:center;" | down 2nd
Line 62: Line 89:
| style="text-align:center;" | 4
| style="text-align:center;" | 4
| style="text-align:center;" | 171.43
| style="text-align:center;" | 171.43
|181.71
|219.43 (DB.6E<sub>16</sub>)
| style="text-align:center;" | 11:10
| style="text-align:center;" | 11:10
| style="text-align:center;" | 165.00
| style="text-align:center;" | 165
|174.9
|211.205 (D3.35<sub>16</sub>)
| style="text-align:center;" | 6.43
| style="text-align:center;" | 6.43
| style="text-align:center;" | 2nd
| style="text-align:center;" | 2nd
Line 71: Line 102:
| style="text-align:center;" | 5
| style="text-align:center;" | 5
| style="text-align:center;" | 214.29
| style="text-align:center;" | 214.29
|227.14
|274.27 (112.49<sub>16</sub>)
| style="text-align:center;" | 17:15
| style="text-align:center;" | 17:15
| style="text-align:center;" | 216.69
| style="text-align:center;" | 216.69
|229.69
|277.36 (115.5C<sub>16</sub>)
| style="text-align:center;" | -2.40
| style="text-align:center;" | -2.40
| style="text-align:center;" | up 2nd
| style="text-align:center;" | up 2nd
Line 80: Line 115:
| style="text-align:center;" | 6
| style="text-align:center;" | 6
| style="text-align:center;" | 257.14
| style="text-align:center;" | 257.14
|272.57
|329.14 (149.25<sub>16</sub>)
| style="text-align:center;" | 7:6
| style="text-align:center;" | 7:6
| style="text-align:center;" | 266.87
| style="text-align:center;" | 266.87
|282.88
|341.595 (155.98<sub>16</sub>)
| style="text-align:center;" | -9.73
| style="text-align:center;" | -9.73
| style="text-align:center;" | double-up 2nd, double-down 3rd
| style="text-align:center;" | double-up 2nd, double-down 3rd
Line 89: Line 128:
| style="text-align:center;" | 7
| style="text-align:center;" | 7
| style="text-align:center;" | 300
| style="text-align:center;" | 300
|318
|384 (180<sub>16</sub>)
| style="text-align:center;" | 6:5
| style="text-align:center;" | 6:5
| style="text-align:center;" | 315.64
| style="text-align:center;" | 315.64
|334.58
|404.02 (194.05<sub>16</sub>)
| style="text-align:center;" | -15.64
| style="text-align:center;" | -15.64
| style="text-align:center;" | down 3rd
| style="text-align:center;" | down 3rd
Line 98: Line 141:
| style="text-align:center;" | 8
| style="text-align:center;" | 8
| style="text-align:center;" | 342.86
| style="text-align:center;" | 342.86
|363.43
|438.86 (1B6.DC<sub>16</sub>)
| style="text-align:center;" | 11:9
| style="text-align:center;" | 11:9
| style="text-align:center;" | 347.41
| style="text-align:center;" | 347.41
|368.25
|444.68 (1BC.AF<sub>16</sub>)
| style="text-align:center;" | -4.55
| style="text-align:center;" | -4.55
| style="text-align:center;" | 3rd
| style="text-align:center;" | 3rd
Line 107: Line 154:
| style="text-align:center;" | 9
| style="text-align:center;" | 9
| style="text-align:center;" | 385.71
| style="text-align:center;" | 385.71
|408.86
|493.71 (1ED.B7<sub>16</sub>)
| style="text-align:center;" | 5:4
| style="text-align:center;" | 5:4
| style="text-align:center;" | 386.31
| style="text-align:center;" | 386.31
|409.49
|494.48 (1EE.7B<sub>16</sub>)
| style="text-align:center;" | -0.60
| style="text-align:center;" | -0.60
| style="text-align:center;" | up 3rd
| style="text-align:center;" | up 3rd
Line 116: Line 167:
| style="text-align:center;" | 10
| style="text-align:center;" | 10
| style="text-align:center;" | 428.57
| style="text-align:center;" | 428.57
|454.29
|548.57 (224.92<sub>16</sub>)
| style="text-align:center;" | 9:7
| style="text-align:center;" | 9:7
| style="text-align:center;" | 435.08
| style="text-align:center;" | 435.08
|461.19
|556.91 (22A.E8<sub>16</sub>)
| style="text-align:center;" | -6.51
| style="text-align:center;" | -6.51
| style="text-align:center;" | double-up 3rd, double-down 4th
| style="text-align:center;" | double-up 3rd, double-down 4th
Line 125: Line 180:
| style="text-align:center;" | 11
| style="text-align:center;" | 11
| style="text-align:center;" | 471.43
| style="text-align:center;" | 471.43
|499.71
|603.43 (26B.6E<sub>16</sub>)
| style="text-align:center;" | 21:16
| style="text-align:center;" | 21:16
| style="text-align:center;" | 470.78
| style="text-align:center;" | 470.78
|499.03
|602.6 (25A.99<sub>16</sub>)
| style="text-align:center;" | 0.65
| style="text-align:center;" | 0.65
| style="text-align:center;" | down 4th
| style="text-align:center;" | down 4th
Line 134: Line 193:
| style="text-align:center;" | 12
| style="text-align:center;" | 12
| style="text-align:center;" | 514.29
| style="text-align:center;" | 514.29
|545.14
|658.29 (292.49<sub>16</sub>)
| style="text-align:center;" | 4:3
| style="text-align:center;" | 4:3
| style="text-align:center;" | 498.04
| style="text-align:center;" | 498.045
| style="text-align:center;" | 16.25
|527.93
|637.5 (27D.7F<sub>16</sub>)
| style="text-align:center;" | 16.245
| style="text-align:center;" | 4th
| style="text-align:center;" | 4th
| style="text-align:center;" | 4
| style="text-align:center;" | 4
Line 143: Line 206:
| style="text-align:center;" | 13
| style="text-align:center;" | 13
| style="text-align:center;" | 557.14
| style="text-align:center;" | 557.14
|590.57
|713.14 (2C9.25<sub>16</sub>)
| style="text-align:center;" | 11:8
| style="text-align:center;" | 11:8
| style="text-align:center;" | 551.32
| style="text-align:center;" | 551.32
|584.4
|705.69 (2C1.B<sub>16</sub>)
| style="text-align:center;" | 5.82
| style="text-align:center;" | 5.82
| style="text-align:center;" | up 4th
| style="text-align:center;" | up 4th
Line 152: Line 219:
| style="text-align:center;" | 14
| style="text-align:center;" | 14
| style="text-align:center;" | 600
| style="text-align:center;" | 600
|636
|768 (300<sub>16</sub>)
| style="text-align:center;" | 7:5
| style="text-align:center;" | 7:5
| style="text-align:center;" | 582.51
| style="text-align:center;" | 582.51
|617.46
|745.62 (2E9.9E<sub>16</sub>)
| style="text-align:center;" | 17.49
| style="text-align:center;" | 17.49
| style="text-align:center;" | double-up 4th, double-down 5th
| style="text-align:center;" | double-up 4th, double-down 5th
Line 161: Line 232:
| style="text-align:center;" | 15
| style="text-align:center;" | 15
| style="text-align:center;" | 642.86
| style="text-align:center;" | 642.86
|681.43
|822.86 (336.DC<sub>16</sub>)
| style="text-align:center;" | 16:11
| style="text-align:center;" | 16:11
| style="text-align:center;" | 648.68
| style="text-align:center;" | 648.68
|687.6
|830.31 (33E.5<sub>16</sub>)
| style="text-align:center;" | -5.82
| style="text-align:center;" | -5.82
| style="text-align:center;" | down 5th
| style="text-align:center;" | down 5th
Line 170: Line 245:
| style="text-align:center;" | 16
| style="text-align:center;" | 16
| style="text-align:center;" | 685.71
| style="text-align:center;" | 685.71
|726.86
|877.71 (36D.B7<sub>16</sub>)
| style="text-align:center;" | 3:2
| style="text-align:center;" | 3:2
| style="text-align:center;" | 701.96
| style="text-align:center;" | 701.955
| style="text-align:center;" | -16.25
|744.07
|898.5 (382.81<sub>16</sub>)
| style="text-align:center;" | -16.245
| style="text-align:center;" | 5th
| style="text-align:center;" | 5th
| style="text-align:center;" | 5
| style="text-align:center;" | 5
Line 179: Line 258:
| style="text-align:center;" | 17
| style="text-align:center;" | 17
| style="text-align:center;" | 728.57
| style="text-align:center;" | 728.57
|772.29
|934.57 (3A4.92<sub>16</sub>)
| style="text-align:center;" | 32:21
| style="text-align:center;" | 32:21
| style="text-align:center;" | 729.22
| style="text-align:center;" | 729.22
|772.97
|933.6 (3A5.67<sub>16</sub>)
| style="text-align:center;" | -0.65
| style="text-align:center;" | -0.65
| style="text-align:center;" | up 5th
| style="text-align:center;" | up 5th
Line 188: Line 271:
| style="text-align:center;" | 18
| style="text-align:center;" | 18
| style="text-align:center;" | 771.43
| style="text-align:center;" | 771.43
|817.71
|987.43 (3DB.6E<sub>16</sub>)
| style="text-align:center;" | 14:9
| style="text-align:center;" | 14:9
| style="text-align:center;" | 764.92
| style="text-align:center;" | 764.92
|810.81
|979.09 (3C3.18<sub>16</sub>)
| style="text-align:center;" | 6.51
| style="text-align:center;" | 6.51
| style="text-align:center;" | double-up 5th, double-down 6th
| style="text-align:center;" | double-up 5th, double-down 6th
Line 197: Line 284:
| style="text-align:center;" | 19
| style="text-align:center;" | 19
| style="text-align:center;" | 814.29
| style="text-align:center;" | 814.29
| style="text-align:center;" | 5:8
|863.14
|1042.29 (412.49<sub>16</sub>)
| style="text-align:center;" | 8:5
| style="text-align:center;" | 813.68
| style="text-align:center;" | 813.68
|862.51
|1041.52 (411.84<sub>16</sub>)
| style="text-align:center;" | 0.61
| style="text-align:center;" | 0.61
| style="text-align:center;" | down 6th
| style="text-align:center;" | down 6th
Line 206: Line 297:
| style="text-align:center;" | 20
| style="text-align:center;" | 20
| style="text-align:center;" | 857.14
| style="text-align:center;" | 857.14
|908.57
|1097.14 (449.24<sub>16</sub>)
| style="text-align:center;" | 18:11
| style="text-align:center;" | 18:11
| style="text-align:center;" | 852.59
| style="text-align:center;" | 852.59
|903.75
|1061.32 (425.51<sub>16</sub>)
| style="text-align:center;" | 4.55
| style="text-align:center;" | 4.55
| style="text-align:center;" | 6th
| style="text-align:center;" | 6th
Line 215: Line 310:
| style="text-align:center;" | 21
| style="text-align:center;" | 21
| style="text-align:center;" | 900
| style="text-align:center;" | 900
|954
|1152 (480<sub>16</sub>)
| style="text-align:center;" | 5:3
| style="text-align:center;" | 5:3
| style="text-align:center;" | 884.36
| style="text-align:center;" | 884.36
|937.42
|1131.98 (46B.FB<sub>16</sub>)
| style="text-align:center;" | 15.64
| style="text-align:center;" | 15.64
| style="text-align:center;" | up 6th
| style="text-align:center;" | up 6th
Line 224: Line 323:
| style="text-align:center;" | 22
| style="text-align:center;" | 22
| style="text-align:center;" | 942.86
| style="text-align:center;" | 942.86
|999.43
|1206.86 (4B6.DC<sub>16</sub>)
| style="text-align:center;" | 12:7
| style="text-align:center;" | 12:7
| style="text-align:center;" | 933.13
| style="text-align:center;" | 933.13
|989.12
|1194.405 (4AA.68<sub>16</sub>)
| style="text-align:center;" | 9.73
| style="text-align:center;" | 9.73
| style="text-align:center;" | double-up 6th, double-down 7th
| style="text-align:center;" | double-up 6th, double-down 7th
Line 233: Line 336:
| style="text-align:center;" | 23
| style="text-align:center;" | 23
| style="text-align:center;" | 985.71
| style="text-align:center;" | 985.71
|1044.86
|1261.71 (4DC.49<sub>16</sub>)
| style="text-align:center;" | 30:17
| style="text-align:center;" | 30:17
| style="text-align:center;" | 983.31
| style="text-align:center;" | 983.31
|1042.31
|1258.64 (4EA.A4<sub>16</sub>)
| style="text-align:center;" | 2.40
| style="text-align:center;" | 2.40
| style="text-align:center;" | down 7th
| style="text-align:center;" | down 7th
Line 242: Line 349:
| style="text-align:center;" | 24
| style="text-align:center;" | 24
| style="text-align:center;" | 1028.57
| style="text-align:center;" | 1028.57
|1090.29
|1316.57 (524.92<sub>16</sub>)
| style="text-align:center;" | 20:11
| style="text-align:center;" | 20:11
| style="text-align:center;" | 1035.00
| style="text-align:center;" | 1035
|1097.1
|1324.795 (52C.CB<sub>16</sub>)
| style="text-align:center;" | -6.43
| style="text-align:center;" | -6.43
| style="text-align:center;" | 7th
| style="text-align:center;" | 7th
Line 251: Line 362:
| style="text-align:center;" | 25
| style="text-align:center;" | 25
| style="text-align:center;" | 1071.42
| style="text-align:center;" | 1071.42
|1135.71
|1371.43 (55A.6E<sub>16</sub>)
| style="text-align:center;" | 13:7
| style="text-align:center;" | 13:7
| style="text-align:center;" | 1071.70
| style="text-align:center;" | 1071.70
|1136
|1371.78 (54B.C8<sub>16</sub>)
| style="text-align:center;" | -0.27
| style="text-align:center;" | -0.27
| style="text-align:center;" | up 7th
| style="text-align:center;" | up 7th
Line 260: Line 375:
| style="text-align:center;" | 26
| style="text-align:center;" | 26
| style="text-align:center;" | 1114.29
| style="text-align:center;" | 1114.29
|1181.14
|1426.29 (592.49<sub>16</sub>)
| style="text-align:center;" | 40:21
| style="text-align:center;" | 40:21
| style="text-align:center;" | 1115.53
| style="text-align:center;" | 1115.53
|1162.465
|1427.88 (593.E2<sub>16</sub>)
| style="text-align:center;" | -1.24
| style="text-align:center;" | -1.24
| style="text-align:center;" | double-up 7th, double-down 8ve
| style="text-align:center;" | double-up 7th, double-down 8ve
Line 269: Line 388:
| style="text-align:center;" | 27
| style="text-align:center;" | 27
| style="text-align:center;" | 1157.14
| style="text-align:center;" | 1157.14
|1226.57
|1471.14 (5C9.25<sub>16</sub>)
| style="text-align:center;" |  
| style="text-align:center;" |  
| style="text-align:center;" |  
| style="text-align:center;" |  
|
|
| style="text-align:center;" |  
| style="text-align:center;" |  
| style="text-align:center;" | down 8ve
| style="text-align:center;" | down 8ve
Line 278: Line 401:
| style="text-align:center;" | 28
| style="text-align:center;" | 28
| style="text-align:center;" | 1200
| style="text-align:center;" | 1200
|1272
|1536 (600<sub>16</sub>)
| style="text-align:center;" | 2:1
| style="text-align:center;" | 2:1
| style="text-align:center;" | 1200
| style="text-align:center;" | 1200
|1272
|1536 (600<sub>16</sub>)
| style="text-align:center;" | 0
| style="text-align:center;" | 0
| style="text-align:center;" | 8ve
| style="text-align:center;" | 8ve
Line 389: Line 516:
|-
|-
| style="text-align:center;" | 2187/2048
| style="text-align:center;" | 2187/2048
| | | -11 7 &gt;
| |<nowiki> | -11 7 </nowiki>&gt;
| style="text-align:center;" | 113.69
| style="text-align:center;" | 113.69
| style="text-align:center;" | Apotome
| style="text-align:center;" | Apotome
Line 395: Line 522:
|-
|-
| style="text-align:center;" | 648/625
| style="text-align:center;" | 648/625
| | | 3 4 -4 &gt;
| |<nowiki> | 3 4 -4 </nowiki>&gt;
| style="text-align:center;" | 62.57
| style="text-align:center;" | 62.57
| style="text-align:center;" | Major Diesis
| style="text-align:center;" | Major Diesis
Line 401: Line 528:
|-
|-
| style="text-align:center;" | 16875/16384
| style="text-align:center;" | 16875/16384
| | | -14 3 4 &gt;
| |<nowiki> | -14 3 4 </nowiki>&gt;
| style="text-align:center;" | 51.12
| style="text-align:center;" | 51.12
| style="text-align:center;" | Negri Comma
| style="text-align:center;" | Negri Comma
Line 407: Line 534:
|-
|-
| style="text-align:center;" |  
| style="text-align:center;" |  
| | | 17 1 -8 &gt;
| |<nowiki> | 17 1 -8 </nowiki>&gt;
| style="text-align:center;" | 11.45
| style="text-align:center;" | 11.45
| style="text-align:center;" | Wuerschmidt Comma
| style="text-align:center;" | Wuerschmidt Comma
Line 413: Line 540:
|-
|-
| style="text-align:center;" | 36/35
| style="text-align:center;" | 36/35
| | | 2 2 -1 -1 &gt;
| |<nowiki> | 2 2 -1 -1 </nowiki>&gt;
| style="text-align:center;" | 48.77
| style="text-align:center;" | 48.77
| style="text-align:center;" | Septimal Quarter Tone
| style="text-align:center;" | Septimal Quarter Tone
Line 419: Line 546:
|-
|-
| style="text-align:center;" | 50/49
| style="text-align:center;" | 50/49
| | | 1 0 2 -2 &gt;
| |<nowiki> | 1 0 2 -2 </nowiki>&gt;
| style="text-align:center;" | 34.98
| style="text-align:center;" | 34.98
| style="text-align:center;" | Tritonic Diesis
| style="text-align:center;" | Tritonic Diesis
Line 425: Line 552:
|-
|-
| style="text-align:center;" | 3125/3087
| style="text-align:center;" | 3125/3087
| | | 0 -2 5 -3 &gt;
| |<nowiki> | 0 -2 5 -3 </nowiki>&gt;
| style="text-align:center;" | 21.18
| style="text-align:center;" | 21.18
| style="text-align:center;" | Gariboh
| style="text-align:center;" | Gariboh
Line 431: Line 558:
|-
|-
| style="text-align:center;" | 126/125
| style="text-align:center;" | 126/125
| | | 1 2 -3 1 &gt;
| |<nowiki> | 1 2 -3 1 </nowiki>&gt;
| style="text-align:center;" | 13.79
| style="text-align:center;" | 13.79
| style="text-align:center;" | Septimal Semicomma
| style="text-align:center;" | Septimal Semicomma
Line 437: Line 564:
|-
|-
| style="text-align:center;" | 65625/65536
| style="text-align:center;" | 65625/65536
| | | -16 1 5 1 &gt;
| |<nowiki> | -16 1 5 1 </nowiki>&gt;
| style="text-align:center;" | 2.35
| style="text-align:center;" | 2.35
| style="text-align:center;" | Horwell
| style="text-align:center;" | Horwell
Line 443: Line 570:
|-
|-
| style="text-align:center;" |  
| style="text-align:center;" |  
| | | 47 -7 -7 -7 &gt;
| |<nowiki> | 47 -7 -7 -7 </nowiki>&gt;
| style="text-align:center;" | 0.34
| style="text-align:center;" | 0.34
| style="text-align:center;" | Akjaysma
| style="text-align:center;" | Akjaysma
Line 449: Line 576:
|-
|-
| style="text-align:center;" | 176/175
| style="text-align:center;" | 176/175
| | | 4 0 -2 -1 1 &gt;
| |<nowiki> | 4 0 -2 -1 1 </nowiki>&gt;
| style="text-align:center;" | 9.86
| style="text-align:center;" | 9.86
| style="text-align:center;" | Valinorsma
| style="text-align:center;" | Valinorsma
Line 455: Line 582:
|-
|-
| style="text-align:center;" | 441/440
| style="text-align:center;" | 441/440
| | | -3 2 -1 2 -1 &gt;
| |<nowiki> | -3 2 -1 2 -1 </nowiki>&gt;
| style="text-align:center;" | 3.93
| style="text-align:center;" | 3.93
| style="text-align:center;" | Werckisma
| style="text-align:center;" | Werckisma
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|-
|-
| style="text-align:center;" | 4000/3993
| style="text-align:center;" | 4000/3993
| | | 5 -1 3 0 -3 &gt;
| |<nowiki> | 5 -1 3 0 -3 </nowiki>&gt;
| style="text-align:center;" | 3.03
| style="text-align:center;" | 3.03
| style="text-align:center;" | Wizardharry
| style="text-align:center;" | Wizardharry

Revision as of 01:10, 31 March 2019


Basic properties

28edo, a multiple of both 7edo and 14edo (and of course 2edo and 4edo), has a step size of 42.857 cents. It shares three intervals with 12edo: the 300 cent minor third, the 600 cent tritone, and the 900 cent major sixth. Thus it tempers out the greater diesis 648:625. It does not however temper out the 128:125 lesser diesis, as its major third is less than 1 cent flat (and its inversion the minor sixth less than 1 cent sharp). It has the same perfect fourth and fifth as 7edo. It also has decent approximations of several septimal intervals, of which 9/7 and its inversion 14/9 are also found in 14edo.

Subgroups

28edo can approximate the 7-limit subgroup 2.27.5.21 quite well, and on this subgroup it has the same commas and tunings as 84edo. The temperament corresponding to orwell temperament now has a major third as generator, though as before 225/224, 1728/1715 and 6144/6125 are tempered out. The 225/224-tempered version of the augmented triad has a very low complexity, so many of them appear in the MOS scales for this temperament, which have sizes 7, 10, 13, 16, 19, 22, 25.

Another subgroup for which 28edo works quite well is 2.5.11.19.21.27.29.39.

Table of intervals

The following table compares it to potentially useful nearby just intervals.

Step # ET Just Difference

(ET minus Just)

Up/down Notation
Cents pions 7mus Interval Cents pions 7mus
0 ¢ 0 unison 1 D
1 42.86 45.43 54.86 (36.DC16) up-unison ^1 D^
2 85.71 90.86 109.71 (6D.B716) 21:20 84.47 89.535 108.12 (6C.1E16) 1.24 double-up, double-down ^^1, vv2 D^^, Evv
3 128.57 136.29 164.57 (A4.9216) 14:13 128.3 136 164.22 (A4.3816) 0.27 down 2nd v2 Ev
4 171.43 181.71 219.43 (DB.6E16) 11:10 165 174.9 211.205 (D3.3516) 6.43 2nd 2 E
5 214.29 227.14 274.27 (112.4916) 17:15 216.69 229.69 277.36 (115.5C16) -2.40 up 2nd ^2 E^
6 257.14 272.57 329.14 (149.2516) 7:6 266.87 282.88 341.595 (155.9816) -9.73 double-up 2nd, double-down 3rd ^^2, vv3 E^^, Fvv
7 300 318 384 (18016) 6:5 315.64 334.58 404.02 (194.0516) -15.64 down 3rd v3 Fv
8 342.86 363.43 438.86 (1B6.DC16) 11:9 347.41 368.25 444.68 (1BC.AF16) -4.55 3rd 3 F
9 385.71 408.86 493.71 (1ED.B716) 5:4 386.31 409.49 494.48 (1EE.7B16) -0.60 up 3rd ^3 F^
10 428.57 454.29 548.57 (224.9216) 9:7 435.08 461.19 556.91 (22A.E816) -6.51 double-up 3rd, double-down 4th ^^3, vv4 F^^, Gvv
11 471.43 499.71 603.43 (26B.6E16) 21:16 470.78 499.03 602.6 (25A.9916) 0.65 down 4th v4 Gv
12 514.29 545.14 658.29 (292.4916) 4:3 498.045 527.93 637.5 (27D.7F16) 16.245 4th 4 G
13 557.14 590.57 713.14 (2C9.2516) 11:8 551.32 584.4 705.69 (2C1.B16) 5.82 up 4th ^4 G^
14 600 636 768 (30016) 7:5 582.51 617.46 745.62 (2E9.9E16) 17.49 double-up 4th, double-down 5th ^^4, vv5 G^^, vvA
15 642.86 681.43 822.86 (336.DC16) 16:11 648.68 687.6 830.31 (33E.516) -5.82 down 5th v5 Av
16 685.71 726.86 877.71 (36D.B716) 3:2 701.955 744.07 898.5 (382.8116) -16.245 5th 5 A
17 728.57 772.29 934.57 (3A4.9216) 32:21 729.22 772.97 933.6 (3A5.6716) -0.65 up 5th ^5 A^
18 771.43 817.71 987.43 (3DB.6E16) 14:9 764.92 810.81 979.09 (3C3.1816) 6.51 double-up 5th, double-down 6th ^^5, vv6 A^^, Bvv
19 814.29 863.14 1042.29 (412.4916) 8:5 813.68 862.51 1041.52 (411.8416) 0.61 down 6th v6 Bv
20 857.14 908.57 1097.14 (449.2416) 18:11 852.59 903.75 1061.32 (425.5116) 4.55 6th 6 B
21 900 954 1152 (48016) 5:3 884.36 937.42 1131.98 (46B.FB16) 15.64 up 6th ^6 B^
22 942.86 999.43 1206.86 (4B6.DC16) 12:7 933.13 989.12 1194.405 (4AA.6816) 9.73 double-up 6th, double-down 7th ^^6, vv7 B^^, Cvv
23 985.71 1044.86 1261.71 (4DC.4916) 30:17 983.31 1042.31 1258.64 (4EA.A416) 2.40 down 7th v7 Cv
24 1028.57 1090.29 1316.57 (524.9216) 20:11 1035 1097.1 1324.795 (52C.CB16) -6.43 7th 7 C
25 1071.42 1135.71 1371.43 (55A.6E16) 13:7 1071.70 1136 1371.78 (54B.C816) -0.27 up 7th ^7 C^
26 1114.29 1181.14 1426.29 (592.4916) 40:21 1115.53 1162.465 1427.88 (593.E216) -1.24 double-up 7th, double-down 8ve ^^7, vv8 C^^, Dvv
27 1157.14 1226.57 1471.14 (5C9.2516) down 8ve v8 Dv
28 1200 1272 1536 (60016) 2:1 1200 1272 1536 (60016) 0 8ve 8 D

Chord Names

Ups and downs can be used to name 28edo chords. Because every interval is perfect, the quality can be omitted, and the words major, minor, augmented and diminished are never used.

0-8-16 = C E G = C = C or C perfect

0-7-16 = C Ev G = C(v3) = C down-three

0-9-16 = C E^ G = C(^3) = C up-three

0-8-15 = C E Gv = C(v5) = C down-five

0-9-17 = C E^ G^ = C(^3,^5) = C up-three up-five

0-8-16-24 = C E G B = C7 = C seven

0-8-16-23 = C E G Bv = C(v7) = C down-seven

0-7-16-24 = C Ev G B = C7(v3) = C seven down-three

0-7-16-23 = C Ev G Bv = C.v7 = C dot down seven

For a more complete list, see Ups and Downs Notation - Chord names in other EDOs.

Rank two temperaments

Periods

per octave

Generator Temperaments
1 1\28
1 3\28 Negri
1 5\28 Machine
1 9\28 Worschmidt
1 11\28
1 13\28 Thuja
2 1\28
2 3\28
2 5\28 Antikythera
4 1\28
4 2\28 Demolished
4 3\28
7 1\28 Whitewood
14 1\28

Commas

28 EDO tempers out the following commas. (Note: This assumes the val < 28 44 65 79 97 104 |.)

Comma Monzo Cents Name 1 Name 2
2187/2048 | -11 7 > 113.69 Apotome
648/625 | 3 4 -4 > 62.57 Major Diesis Diminished Comma
16875/16384 | -14 3 4 > 51.12 Negri Comma Double Augmentation Diesis
| 17 1 -8 > 11.45 Wuerschmidt Comma
36/35 | 2 2 -1 -1 > 48.77 Septimal Quarter Tone
50/49 | 1 0 2 -2 > 34.98 Tritonic Diesis Jubilisma
3125/3087 | 0 -2 5 -3 > 21.18 Gariboh
126/125 | 1 2 -3 1 > 13.79 Septimal Semicomma Starling Comma
65625/65536 | -16 1 5 1 > 2.35 Horwell
| 47 -7 -7 -7 > 0.34 Akjaysma 5\7 Octave Comma
176/175 | 4 0 -2 -1 1 > 9.86 Valinorsma
441/440 | -3 2 -1 2 -1 > 3.93 Werckisma
4000/3993 | 5 -1 3 0 -3 > 3.03 Wizardharry

Some scales

machine5

machine6

machine11

Compositions

28 tone Prelude by Kosmorksy