729edt
| ← 728edt | 729edt | 730edt → |
729 equal divisions of the tritave, 729edt, is the tuning system that divides the 3/1 interval into steps of 2.60899 cents each.
729edt is closely related to 460edo, with the difference of 3/1 instead of 2/1 being just. The mappings match through the 23-limit, where they temper out exactly the same commas. Overall, 729edt approximates harmonics 2, 3, 5, 13, and 17 exceptionally well, while 460edo only has this good of an error on the 19th harmonic.
729edt tempers out the [-81 28 -54⟩ comma which sets 27 intervals of 25/24 equal to the tritave.
Prime harmonics
| Harmonic | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Error | Absolute (¢) | +0.14 | +0.00 | +0.09 | -0.62 | -0.41 | -0.02 | -0.05 | +0.46 | +1.04 | -1.09 | +0.86 |
| Relative (%) | +5.2 | +0.0 | +3.4 | -23.7 | -15.8 | -0.9 | -2.0 | +17.5 | +39.8 | -41.8 | +32.8 | |
| Steps (reduced) |
460 (460) |
729 (0) |
1068 (339) |
1291 (562) |
1591 (133) |
1702 (244) |
1880 (422) |
1954 (496) |
2081 (623) |
2234 (47) |
2279 (92) | |