1525edo
| ← 1524edo | 1525edo | 1526edo → |
1525 equal divisions of the octave (abbreviated 1525edo or 1525ed2), also called 1525-tone equal temperament (1525tet) or 1525 equal temperament (1525et) when viewed under a regular temperament perspective, is the tuning system that divides the octave into 1525 equal parts of about 0.787 ¢ each. Each step represents a frequency ratio of 21/1525, or the 1525th root of 2.
1525edo is consistent to the 9-odd-limit, though its approcimation for 7 is worse than for the 5-limit. In higher limits, it is a good 2.3.5.7.13.19.31 system, and an excellent 2.3.5.19 system with an optional addition of 29/23.
In the 5-limit, it tempers out the dipromethia, mapping 2048/2025 into 1\61 as well as the astro comma, [91 -12 -31⟩ and the 25th-octave manganese comma, [211 50 -125⟩. In the 7-limit, it tunes osiris, and in the 2.5.7.11.13 subgroup, french decimal.
Prime harmonics
| Harmonic | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Error | absolute (¢) | +0.000 | -0.053 | +0.047 | -0.170 | +0.289 | -0.134 | -0.300 | -0.070 | -0.340 | -0.331 | -0.118 |
| relative (%) | +0 | -7 | +6 | -22 | +37 | -17 | -38 | -9 | -43 | -42 | -15 | |
| Steps (reduced) |
1525 (0) |
2417 (892) |
3541 (491) |
4281 (1231) |
5276 (701) |
5643 (1068) |
6233 (133) |
6478 (378) |
6898 (798) |
7408 (1308) |
7555 (1455) | |
Subsets and supersets
Since 1525 factors as 52 × 61, 1525edo has subset edos 1, 5, 25, 61, 305.