Mohajira: Difference between revisions
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'''Mohajira'''<ref group="note">(/mʊˈhɑːdʒɪɹə, -hæ-/ ''muu-HA(H)-jirr-ə'' or /məˈhɑːdʒɪɹə, -hæ-/ ''mə-HA(H)-jirr-ə'', named by Jacques Dudon from Arabic مهاجرة ''Muhājirah'')</ref> is a [[Meantone_family#Mohajira|meantone]] temperament that splits 3/2 into two 11/9 generators and the 6/5 into two 11/10's, thus equating 11/10 with 12/11 and 11/9 with 27/22. As a result, eight 11/9s reach 5/4, and five reach 11/8. It tempers the biyatisma ([[121/120]]) and the [[rastma]] (along with meantone's [[syntonic comma]]). It can be thought of as meantone with quarter tones as it merely splits the generator 3/2 into two equally spaced neutral thirds. Among the most common is the seven note MOS mohajira[7] which consists of the steps LsLsLss, as well as the modMOS "Rast" which merely flats the fourth by one quarter tone. | |||
The simplest form of this temperament, in 2.3.5.11, is sometimes called '''mohaha'''. To extend mohaha into full 11-limit mohajira, 7 is found at 11 neutral thirds down, tempering out the [[valinorsma]] such that 14/11 is equated with 32/25. Mohaha is tuned best sharp of 31edo's neutral third. An alternate extension, ''migration,'' is optimized for flatter tunings and finds 7 at 20 generators up, the same mapping as in [[septimal meantone]] which tempers out [[225/224]]. | |||
As mohajira is a neutral third system, 13 also has a reasonable mapping at -1 generator, equating 11/9 and 16/13. Subsequently, 17 is mapped to -10 generators (the diatonic semitone) and 19 to -6 generators (the minor third). | |||
For temperament data see [[Meantone family #Mohajira]]. | |||
== Interval chain == | |||
{| class="wikitable" | |||
|+ | |||
! colspan="3" |Up from the tonic, and fifthward | |||
! colspan="3" |Down from the octave, and fourthward | |||
|- | |||
!# | |||
!Cents* | |||
!Ratios | |||
!# | |||
!Cents* | |||
!Ratios | |||
|- | |||
|0 | |||
|0 | |||
|'''1/1''' | |||
|0 | |||
|1200 | |||
|'''2/1''' | |||
|- | |||
|1 | |||
|348.7 | |||
|11/9, 27/22 | |||
| -1 | |||
|851.3 | |||
|44/27, 18/11 | |||
|- | |||
|2 | |||
|697.4 | |||
|'''3/2''' | |||
| -2 | |||
|502.6 | |||
|4/3 | |||
|- | |||
|3 | |||
|1046.1 | |||
|20/11, 11/6 | |||
| -3 | |||
|153.9 | |||
|11/10, 12/11 | |||
|- | |||
|4 | |||
|194.8 | |||
|9/8, 10/9 | |||
| -4 | |||
|1005.2 | |||
|9/5, 16/9 | |||
|- | |||
|5 | |||
|543.5 | |||
|'''11/8''' | |||
| -5 | |||
|656.5 | |||
|16/11 | |||
|- | |||
|6 | |||
|892.2 | |||
|5/3 | |||
| -6 | |||
|307.8 | |||
|6/5 | |||
|- | |||
|7 | |||
|40.9 | |||
|33/32 | |||
| -7 | |||
|1159.1 | |||
|64/33 | |||
|- | |||
|8 | |||
|389.6 | |||
|'''5/4''' | |||
| -8 | |||
|810.4 | |||
|8/5 | |||
|- | |||
|9 | |||
|738.3 | |||
|32/21 | |||
| -9 | |||
|461.7 | |||
|21/16 | |||
|- | |||
|10 | |||
|1087 | |||
|15/8 | |||
| -10 | |||
|113 | |||
|16/15 | |||
|- | |||
|11 | |||
|235.7 | |||
|8/7 | |||
| -11 | |||
|964.3 | |||
|'''7/4''' | |||
|- | |||
|12 | |||
|584.4 | |||
|45/32 | |||
| -12 | |||
|615.6 | |||
|64/45 | |||
|- | |||
|13 | |||
|933.1 | |||
|12/7 | |||
| -13 | |||
|266.9 | |||
|7/6 | |||
|- | |||
|14 | |||
|81.8 | |||
|25/24 | |||
| -14 | |||
|1118.2 | |||
|48/25 | |||
|- | |||
|15 | |||
|430.5 | |||
|9/7 | |||
| -15 | |||
|769.5 | |||
|14/9 | |||
|- | |||
|16 | |||
|779.2 | |||
|11/7 | |||
| -16 | |||
|420.8 | |||
|14/11 | |||
|} | |||
== Scales and harmony == | |||
: {{main|Mohajira/Scales}} | |||
There are seven modes of mohajira's 7-note MOS (named [[mosh]] due to being "mohajira-ish") which are structured in an analogous way to the seven modes of the major scale. They can be thought of as quarter tone altered modes in a 24 EDO setting, but also as microtonal altered scales in any equal temperament. While the Mohajira[7] MOS by itself is quite beautiful, the modMOS Rast tends to be more expressive as it contains a few major and minor thirds allowing for more contrast. | |||
== Notes == | |||
<references group="note" /> | |||
[[Category:Mohajira| ]] <!-- main article --> | |||
[[Category:Rank-2 temperaments]] | |||
[[Category:Meantone family]] |