513/512: Difference between revisions
Cmloegcmluin (talk | contribs) add section for this comma's use in Sagittal notation |
Dave Keenan (talk | contribs) →Sagittal notation: Added downward version |
||
| Line 13: | Line 13: | ||
== Sagittal notation == | == Sagittal notation == | ||
In the [[Sagittal]] system, this comma (possibly tempered) is represented by the sagittal {{sagittal | )| }} and is called the '''19 schisma''', or '''19s''' for short, because the simplest ratio it notates is 16:19, as for example in D:F{{sagittal | )| }}. | In the [[Sagittal]] system, this comma (possibly tempered) is represented by the sagittal {{sagittal | )| }} and is called the '''19 schisma''', or '''19s''' for short, because the simplest ratio it notates is 16:19, as for example in D:F {{sagittal | )| }}. The downward version is called '''1/19s''' or '''19s down''' and is represented by {{sagittal| )! }}. | ||
== See also == | == See also == | ||
Revision as of 13:48, 9 October 2024
| Interval information |
undevicesimal schisma,
Boethius' comma
Lano comma
reduced,
reduced harmonic
513/512, the undevicesimal comma, undevicesimal schisma or Boethius' comma, is an unnoticeable 19-limit (also 2.3.19 subgroup) comma. It is the amount by which 19/16 exceeds the Pythagorean minor third (32/27). It is significant in Functional Just System and Helmholtz-Ellis notation as the formal comma to translate a Pythagorean interval to a nearby undevicesimal interval.
Temperaments
- "Boethius" redirects here. For the medieval Roman platonist, see Wikipedia: Boethius.
By tempering out this comma in the 19-limit is defined the boethius temperament, or in the 2.3.19 subgroup, the boethian temperament. Both enables the boethius chords.
Sagittal notation
In the Sagittal system, this comma (possibly tempered) is represented by the sagittal and is called the 19 schisma, or 19s for short, because the simplest ratio it notates is 16:19, as for example in D:F . The downward version is called 1/19s or 19s down and is represented by .