135/128: Difference between revisions
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The [[5-limit]] interval '''135/128''', about 92.2 [[cent]]s in size, is called the '''ptolemaic chromatic semitone''', '''major limma''' or '''major chroma'''. It is a [[syntonic comma]] away from the Pythagorean chromatic semitone [[2187/2048]], and so is tuned justly in 1/7 comma meantone. Flattening by another syntonic comma reaches the even simpler [[25/24]]. | The [[5-limit]] interval '''135/128''', about 92.2 [[cent]]s in size, is called the '''ptolemaic chromatic semitone''', '''major limma''' or '''major chroma'''. It is a [[syntonic comma]] away from the Pythagorean chromatic semitone [[2187/2048]], and so is tuned justly in 1/7 comma meantone. Flattening by another syntonic comma reaches the even simpler [[25/24]]. | ||
As a [[comma]], the '''pelogic comma''', it represents the difference between three [[4/3|perfect fourths]] and a [[5/4|just major third]] (plus an [[octave]]). | As a [[comma]], it is known as the '''pelogic comma''', and it represents the difference between three [[4/3|perfect fourths]] and a [[5/4|just major third]] (plus an [[octave]]). | ||
== See also == | == See also == | ||