55edo
55edo divides the octave into 55 parts of 21.818 ¢. It can be used for a meantone tuning, and is close to 1/6 comma meantone (and is almost exactly 10/57 comma meantone.) Telemann suggested it as a theoretical basis for analyzing the intervals of meantone, in which he was followed by Leopold and Wolfgang Mozart. It can also be used for mohajira and liese temperaments.
Theory
| Harmonic | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 17 | 19 | 21 | 23 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Error | Absolute (¢) | -3.77 | +6.41 | -8.83 | -7.55 | -5.86 | +10.38 | +2.64 | +4.14 | +7.94 | +9.22 | +4.45 |
| Relative (%) | -17.3 | +29.4 | -40.5 | -34.6 | -26.9 | +47.6 | +12.1 | +19.0 | +36.4 | +42.3 | +20.4 | |
| Steps (reduced) |
87 (32) |
128 (18) |
154 (44) |
174 (9) |
190 (25) |
204 (39) |
215 (50) |
225 (5) |
234 (14) |
242 (22) |
249 (29) | |
5-limit commas: 81/80, [31 1 -14⟩, [27 5 -15⟩
7-limit commas: 31104/30625, 6144/6125, 81648/78125, 16128/15625, 28672/28125, 33075/32768, 83349/80000, 1029/1000, 686/675, 10976/10935, 16807/16384, 84035/82944
11-limit commas: 59049/58564, 74088/73205, 46656/46585, 21609/21296, 12005/11979, 19683/19360, 243/242, 3087/3025, 5488/5445, 19683/19250, 1944/1925, 45927/45056, 2835/2816, 35721/34375, 7056/6875, 12544/12375, 7203/7040, 2401/2376, 24057/24010, 72171/70000, 891/875, 176/175, 2079/2048, 385/384, 3234/3125, 17248/16875, 26411/25600, 26411/2592, 26411/262404, 88209/87808, 30976/30625, 3267/3200, 121/120, 81312/78125, 41503/40000, 41503/40500, 35937/35000, 2662/2625, 42592/42525, 83853/81920, 9317/9216, 65219/62500, 43923/43904, 14641/14400, 14641/14580
13-limit commas: 59535/57122, 29400/28561, 29568/28561, 29645/28561, 24576/24167, 99225/96668, 24500/24167, 50421/48334, 45927/43940, 2268/2197, 2240/2197, 57624/54925, 61875/61516, 57024/54925, 11264/10985, 72765/70304, 13475/13182, 22869/21970, 6776/6591, 20736/20449, 20480/20449, 84035/81796, 91125/91091, 65536/65065, 15309/14872, 1890/1859, 5600/5577, 9604/9295, 59049/57967, 58320/57967, 4374/4225, 864/845, 512/507, 11025/10816, 6125/6084, 21952/21125, 16807/16224, 84035/82134, 66825/66248, 90112/88725, 56133/54080, 693/676, 1540/1521, 26411/25350, 58806/57967, 58080/57967, 88209/84500, 4356/4225, 7744/7605, 88935/86528, 33275/33124, 27951/27040, 9317/9126, 58564/57967, 43923/42250, 17496/17303, 87808/86515, 55296/55055, 25515/25168, 1575/1573, 64827/62920, 4802/4719, 98415/98098, 59049/57200, 729/715, 144/143, 18375/18304, 18522/17875, 10976/10725, 84035/82368, 59049/56875, 11664/11375, 2304/2275, 4096/4095, 1701/1664, 105/104, 42336/40625, 25088/24375, 21609/20800, 2401/2340, 9604/9477, 72171/71344, 2673/2600, 66/65, 352/351, 13475/13312, 33957/32500, 15092/14625, 81675/81536, 58806/56875, 11616/11375, 61952/61425, 68607/66560, 847/832, 4235/4212, 35937/35672, 1331/1300, 5324/5265, 58564/56875, 85293/85184, 13377/13310, 85293/84700, 15288/15125, 31213/30976, 67392/67375, 28431/28160, 34944/34375, 4459/4400, 4459/4455, 28431/28000, 351/350, 79872/78125, 66339/65536, 51597/50000, 637/625, 10192/10125, 31213/30720, 31213/31104, 30888/30625, 1287/1280, 81081/78125, 16016/15625, 49049/48000, 49049/48600, 14157/14000, 33033/32768, 77077/75000, 51909/51200, 17303/17280, 75712/75625, 8281/8250, 41067/40960, 31941/31250, 9464/9375, 57967/57600, 91091/90000, 61347/61250, 79092/78125
Intervals
| # | Cents | Approximate ratios |
|---|---|---|
| 0 | 0.000 | 1/1 |
| 1 | 21.818 | 128/125, 64/63, 65/64, 78/77, 91/90, 99/98, 81/80 |
| 2 | 43.636 | 36/35 |
| 3 | 65.4545 | 28/27, 25/24 |
| 4 | 87.273 | 25/24, 21/20 |
| 5 | 109.091 | 16/15 |
| 6 | 130.909 | 14/13, 13/12 |
| 7 | 152.727 | 13/12, 12/11 |
| 8 | 174.5455 | 11/10, 10/9 |
| 9 | 196.364 | 9/8, 10/9 |
| 10 | 218.182 | 17/15 |
| 11 | 240 | 8/7, 15/13 |
| 12 | 261.818 | 7/6 |
| 13 | 283.636 | 13/11 |
| 14 | 305.4545 | 6/5- |
| 15 | 327.273 | 6/5+ |
| 16 | 349.091 | 11/9, 27/22 |
| 17 | 370.909 | 16/13 |
| 18 | 392.727 | 5/4 |
| 19 | 414.5455 | 14/11 |
| 20 | 436.364 | 9/7 |
| 21 | 458.182 | 13/10 |
| 22 | 480 | 21/16 |
| 23 | 501.818 | 4/3, 27/20 |
| 24 | 523.636 | 27/20 |
| 25 | 545.4545 | 11/8 |
| 26 | 567.273 | 18/13, 25/18 |
| 27 | 589.091 | 7/5 |
| 28 | 610.909 | 10/7 |
| 29 | 632.727 | 13/9, 36/25 |
| 30 | 654.5455 | 16/11 |
| 31 | 676.364 | 40/27 |
| 32 | 698.182 | 3/2, 40/27 |
| 33 | 720 | 32/21 |
| 34 | 741.818 | 20/13 |
| 35 | 763.636 | 14/9 |
| 36 | 785.4545 | 11/7 |
| 37 | 807.273 | 8/5 |
| 38 | 829.091 | 13/8 |
| 39 | 850.909 | 18/11, 44/27 |
| 40 | 872.727 | 5/3- |
| 41 | 894.5455 | 5/3+ |
| 42 | 916.364 | 22/13 |
| 43 | 938.182 | 12/7 |
| 44 | 960 | 7/4, 26/15 |
| 45 | 981.818 | 30/17 |
| 46 | 1003.636 | 16/9, 9/5 |
| 47 | 1025.4545 | 9/5, 20/11 |
| 48 | 1047.273 | 11/6, 24/13 |
| 49 | 1069.091 | 24/13, 13/7 |
| 50 | 1090.909 | 15/8 |
| 51 | 1112.727 | 40/21, 48/25 |
| 52 | 1134.5455 | 56/27, 48/25 |
| 53 | 1156.364 | 35/18 |
| 54 | 1178.182 | 125/64, 63/32, 128/65, 77/39, 180/91, 196/99, 160/81 |
| 55 | 1200 | 2/1 |
Selected just intervals by error
The following table shows how 15-odd-limit just intervals are represented in 55edo (ordered by absolute error). The following tables show how 15-odd-limit intervals are represented in 55edo. Prime harmonics are in bold; inconsistent intervals are in italics.
| Interval and complement | Error (abs, ¢) | Error (rel, %) |
|---|---|---|
| 1/1, 2/1 | 0.000 | 0.0 |
| 9/7, 14/9 | 1.280 | 5.9 |
| 11/9, 18/11 | 1.683 | 7.7 |
| 11/6, 12/11 | 2.090 | 9.6 |
| 13/7, 14/13 | 2.611 | 12.0 |
| 15/8, 16/15 | 2.640 | 12.1 |
| 11/7, 14/11 | 2.963 | 13.6 |
| 3/2, 4/3 | 3.773 | 17.3 |
| 13/9, 18/13 | 3.890 | 17.8 |
| 13/10, 20/13 | 3.968 | 18.2 |
| 7/6, 12/7 | 5.053 | 23.2 |
| 13/11, 22/13 | 5.573 | 25.5 |
| 11/8, 16/11 | 5.863 | 26.9 |
| 5/4, 8/5 | 6.414 | 29.4 |
| 7/5, 10/7 | 6.579 | 30.2 |
| 9/8, 16/9 | 7.546 | 34.6 |
| 13/12, 24/13 | 7.664 | 35.1 |
| 15/13, 26/15 | 7.741 | 35.5 |
| 9/5, 10/9 | 7.858 | 36.0 |
| 15/11, 22/15 | 8.504 | 39.0 |
| 7/4, 8/7 | 8.826 | 40.5 |
| 11/10, 20/11 | 9.541 | 43.7 |
| 5/3, 6/5 | 10.187 | 46.7 |
| 15/14, 28/15 | 10.352 | 47.4 |
| 13/8, 16/13 | 10.381 | 47.6 |
| Interval and complement | Error (abs, ¢) | Error (rel, %) |
|---|---|---|
| 1/1, 2/1 | 0.000 | 0.0 |
| 9/7, 14/9 | 1.280 | 5.9 |
| 11/9, 18/11 | 1.683 | 7.7 |
| 11/6, 12/11 | 2.090 | 9.6 |
| 15/8, 16/15 | 2.640 | 12.1 |
| 11/7, 14/11 | 2.963 | 13.6 |
| 3/2, 4/3 | 3.773 | 17.3 |
| 13/10, 20/13 | 3.968 | 18.2 |
| 7/6, 12/7 | 5.053 | 23.2 |
| 11/8, 16/11 | 5.863 | 26.9 |
| 5/4, 8/5 | 6.414 | 29.4 |
| 9/8, 16/9 | 7.546 | 34.6 |
| 15/13, 26/15 | 7.741 | 35.5 |
| 15/11, 22/15 | 8.504 | 39.0 |
| 7/4, 8/7 | 8.826 | 40.5 |
| 5/3, 6/5 | 10.187 | 46.7 |
| 13/8, 16/13 | 10.381 | 47.6 |
| 15/14, 28/15 | 11.466 | 52.6 |
| 11/10, 20/11 | 12.277 | 56.3 |
| 9/5, 10/9 | 13.960 | 64.0 |
| 13/12, 24/13 | 14.155 | 64.9 |
| 7/5, 10/7 | 15.239 | 69.8 |
| 13/11, 22/13 | 16.245 | 74.5 |
| 13/9, 18/13 | 17.928 | 82.2 |
| 13/7, 14/13 | 19.207 | 88.0 |
Music
External links
- "Mozart's tuning: 55edo" (containing another listening example) in the Tonalsoft Encyclopedia