353edo: Difference between revisions
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Revision as of 11:05, 18 January 2022
The 353 equal divisions of the octave (353edo) divides the octave into parts of 3.3994 cents each.
Theory
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From the prime number standpoint, 353edo is suitable for use with 2.7.11.17.23.29.31.37 subgroup. This makes 353edo an "upside-down" EDO – poor approximation of the low harmonics, but an improvement over the high ones. Nonetheless, it provides the optimal patent val for didacus, the 2.5.7 subgroup temperament tempering out 3136/3125.
353edo is the 71st prime EDO.
Relation to a calendar reform
In the original Hebrew calendar, years number 3, 6, 8, 11, 14, 17, and 19 within a 19-year pattern (makhzor, plural:makhzorim) are leap. When converted to 19edo, this results in 5L 2s mode, and simply the diatonic major scale.
Following this logic, a temperament can be constructed for the Rectified Hebrew calendar (see below), containing 130 notes of the 353edo scale. Hebrew[130] scale has 334\353 as its generator, which is a supermajor seventh, or alternately, 19\353, about a third-tone, since inverting the generator has no effect on the scale. Using such small of a generator helps explore the 353edo's "upside down" side. In addition, every sub-pattern in a 19-note generator is actually a Hebrew makhzor, that is a mini-19edo on its own, until it is truncated to an 11-note pattern. Just as the original calendar reform consists of 18 makhzorim with 1 hendecaeteris, Hebrew[130] scale consists of a stack of naively 18 "major scales" finished with one 11-edo tetratonic.
Rectified Hebrew temperament is a 13-limit extension of the didacus. In the 13-limit, the it tempers out 3136/3125, 4394/4375, 10985/10976, and 1968512/1953125.
Specific chords and intervals
Such a temperament gives 19edo a unique stretch: 6\19 corresponds to 5/4, 13\19 corresponds to 13/8, and 15\19 corresponds to 7/4. When measured relative to the generator, the error is less than 1 in 5000.
If 209\353 is loosely assumed to equal 3/2, it offers a 710c stretched fifth, and the following resolution sequence: 7/4 D7 - 13/8 D2 - D53 - T53. This has a very pleasant sound, with 13/8 acting as a "doubled resolvant" or "resolution into resolution". Such an arrangement also "tempers out" 169/168.
Table of intervals
| Step | Name
(diatonic Hebrew[19] version) |
Associated ratio
(2.5.7.13 subgroup) |
|---|---|---|
| 0 | C | 1/1 |
| 19 | C# | |
| 38 | Db | 14/13 |
| 57 | D | |
| 76 | D# | |
| 95 | Eb | |
| 114 | E | 5/4 |
| 133 | E#/Fb | 13/10 minor (best approximation is 134) |
| 152 | F | |
| 171 | F# | 7/5 |
| 190 | Gb | |
| 209 | G | 98/65 |
| 228 | G# | |
| 247 | Ab | 13/8 |
| 266 | A | |
| 285 | A# | 7/4 |
| 304 | Bb | |
| 323 | B | |
| 342 | B#/Cb | |
| 353 | C | 2/1 |
Scales
- RectifiedHebrew[19] - 18L 1s
- 18-Glacial[19] - same as above
- RectifiedHebrew[130] - 93L 37s