82/81: Difference between revisions
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'''82/81''', or the 41'''-limit Johnston comma (HEJI)''', is a 2.3.41 subgroup comma. It is the amount by which 41/32 (the 41st harmonic) exceeds the Pythagorean major third (ditone) of 81/64, and differs from the syntonic comma ([[81/80]]) by [[6561/6560]]. It is significant in [[Helmholtz-Ellis notation]] as the formal comma to translate a Pythagorean interval to a nearby 41-limit (prefix???) interval. It is the parent comma for the [[reversed meantone clan]]. | '''82/81''', or the 41'''-limit Johnston comma (HEJI)''', is a 2.3.41 subgroup comma. It is the amount by which 41/32 (the 41st harmonic) exceeds the Pythagorean major third (ditone) of 81/64, and differs from the syntonic comma ([[81/80]]) by [[6561/6560]]. It is significant in [[Helmholtz-Ellis notation]] as the formal comma to translate a Pythagorean interval to a nearby 41-limit (prefix???) interval. It is the parent comma for the [[reversed meantone clan]]. | ||
[[Category:Commas named after composers]] | |||
[[Category:Commas named after music theorists]] | |||