Interseptimal interval: Difference between revisions

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As they fall in ambiguous zones between simpler categories, they are inevitably xenharmonic. This also makes them difficult to name: do we classify a 250-cent interval as a second, a third, both, or neither? One option is to give each region a distinct name (analogous to using the word ''tritone'' rather than diminished fifth or augmented fourth). Possible names that could be used are:

* 240¢-260¢ -- semifourth -- an interval of this size is around half the size of a perfect fourth. [[User:IlL|Inthar]] proposes the name '''obsidic'''.

* 240¢-260¢ -- semifourth -- an interval of this size is around half the size of a perfect fourth. [[User:IlL|Inthar]] proposes the name '''obsidic''' for this region.

* 440¢-468¢ -- semisixth -- an interval of this size is around half the size of a major sixth. [[Zhea Erose]] calls the 440c-464c region '''naiadic''' and uses it frequently.

* 732¢-760¢ -- semitenth -- an interval of this size is around half the size of a major tenth (i. e., compound major third). Another possible name is sesquifourth (since this is also about one and a half times the size of a perfect fourth). [[User:IlL|Inthar]] proposes the name '''cocytic'''.

* 940¢-960¢ -- semitwelfth -- an interval of this size is around half the size of a perfect twelfth (i e., a compound perfect fifth, or tritave). All even [[edt|edts]] have a semitwelfth of approximately 951 cents, analogous to the 600 cent tritone shared by all even edos.

* 940¢-960¢ -- semitwelfth -- an interval of this size is around half the size of a perfect twelfth (i e., a compound perfect fifth, or tritave). All even [[edt|edts]] have a semitwelfth of approximately 951 cents, analogous to the 600 cent tritone shared by all even edos. [[User:IlL|Inthar]] proposes the name '''nyctic''' for this region.

This makes notating these intervals very easy as long as we have an agreed-upon symbol for "semi".

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 As they fall in ambiguous zones between simpler categories, they are inevitably xenharmonic. This also makes them difficult to name: do we classify a 250-cent interval as a second, a third, both, or neither? One option is to give each region a distinct name (analogous to using the word ''tritone'' rather than diminished fifth or augmented fourth). Possible names that could be used are:
-* 240¢-260¢ -- semifourth -- an interval of this size is around half the size of a perfect fourth. [[User:IlL|Inthar]] proposes the name '''obsidic'''.
+* 240¢-260¢ -- semifourth -- an interval of this size is around half the size of a perfect fourth. [[User:IlL|Inthar]] proposes the name '''obsidic''' for this region.
 * 440¢-468¢ -- semisixth -- an interval of this size is around half the size of a major sixth. [[Zhea Erose]] calls the 440c-464c region '''naiadic''' and uses it frequently.
 * 732¢-760¢ -- semitenth -- an interval of this size is around half the size of a major tenth (i. e., compound major third). Another possible name is sesquifourth (since this is also about one and a half times the size of a perfect fourth). [[User:IlL|Inthar]] proposes the name '''cocytic'''.
-* 940¢-960¢ -- semitwelfth -- an interval of this size is around half the size of a perfect twelfth (i e., a compound perfect fifth, or tritave). All even [[edt|edts]] have a semitwelfth of approximately 951 cents, analogous to the 600 cent tritone shared by all even edos.
+* 940¢-960¢ -- semitwelfth -- an interval of this size is around half the size of a perfect twelfth (i e., a compound perfect fifth, or tritave). All even [[edt|edts]] have a semitwelfth of approximately 951 cents, analogous to the 600 cent tritone shared by all even edos. [[User:IlL|Inthar]] proposes the name '''nyctic''' for this region.
 This makes notating these intervals very easy as long as we have an agreed-upon symbol for "semi".