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{{Infobox Interval | {{Infobox Interval | ||
| Name = | | Name = september comma, septembrisma | ||
| Comma = yes | | Comma = yes | ||
}} | }} | ||
'''715/714''', the ''' | '''715/714''', the '''september comma''' or '''septembrisma''' is a [[17-limit]] [[unnoticeable comma|unnoticeable]] [[superparticular]] comma with a size of approximately 2.42 [[cent]]s. It is also described as the ''septendecimal bridge comma''. | ||
== Commatic relations == | |||
This comma identifies itself as the difference between the following superparticular pairs: | |||
* [[120/119]] and [[144/143]] | |||
* [[154/153]] and [[196/195]] | |||
* [[273/272]] and [[441/440]] | |||
* [[325/324]] and [[595/594]] | |||
* [[385/384]] and [[833/832]] | |||
* [[442/441]] and [[1156/1155]] | |||
* [[561/560]] and [[2601/2600]] | |||
* [[676/675]] and [[12376/12375]] | |||
not to mention some nonsuperparticular but useful relations: | |||
* [[375/374]] and [[1575/1573]] | |||
It factors into the following superparticular pairs: | |||
* [[1225/1224]] and [[1716/1715]] | |||
* [[1089/1088]] and [[2080/2079]] | |||
* [[1001/1000]] and [[2500/2499]] | |||
* [[936/935]] and [[3025/3024]] | |||
* [[729/728]] and [[37180/37179]] | |||
not to mention some nonsuperparticular but useful relations: | |||
* [[2025/2023]] and [[2431/2430]] | |||
* [[2200/2197]] and [[28561/28560]] | |||
== Temperaments == | |||
Tempering out this comma in the 17-limit gives the rank-6 '''september temperament''', and enables the related essentially tempered chords. | |||
== Etymology == | |||
The september comma was named by [[Scott Dakota]] in 2021. | |||
[[Category:September]] | |||