Cataharry comma: Difference between revisions
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The '''cataharry comma''' ('''19683/19600''') is a [[7-limit]] [[comma]] measuring about 6.1 cents. It is the difference between the [[81/70|septimal ultramajor second (81/70)]] and its [[fourth complement]]. In terms of commas, it is the | The '''cataharry comma''' ('''19683/19600''') is a [[7-limit]] [[comma]] measuring about 6.1 cents. It is the difference between the [[81/70|septimal ultramajor second (81/70)]] and its [[fourth complement]]. In terms of commas, it is equal to ([[81/80]])/([[245/243]]) and to ([[81/80]])<sup>2</sup>/([[49/48]]). The latter equivalence implies that if the cataharry comma is tempered out and if neither [[81/80]] nor [[49/48]] are tempered out, there will be an interval ~[[81/80]] above [[8/7]] and ~[[81/80]] below [[7/6]], and analogously for [[12/7]] and [[7/4]]. | ||
== Temperaments == | == Temperaments == | ||
Revision as of 15:09, 9 November 2021
| Interval information |
The cataharry comma (19683/19600) is a 7-limit comma measuring about 6.1 cents. It is the difference between the septimal ultramajor second (81/70) and its fourth complement. In terms of commas, it is equal to (81/80)/(245/243) and to (81/80)2/(49/48). The latter equivalence implies that if the cataharry comma is tempered out and if neither 81/80 nor 49/48 are tempered out, there will be an interval ~81/80 above 8/7 and ~81/80 below 7/6, and analogously for 12/7 and 7/4.
Temperaments
Tempering out this comma leads to the rank-3 cataharry family of temperaments, which splits the just perfect fourth (4/3) into two exact hemifourths, each representing 81/70~280/243.
See also
- Cataharry family, the rank-3 family where it is tempered out
- Cataharry temperaments, a collection of rank-2 temperaments where it is tempered out
- Small comma