980/729
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Ratio | 980/729 |
Monzo | [2 -6 1 2⟩ |
Size in cents | 512.23552 |
Name(s) | sensamagic fourth |
Color name | zzy5, zozoyo 5th |
FJS name | d55, 49 |
980/729, the sensamagic fourth is a 7-limit ratio of about 512 cents, sharp of a just fourth 4/3 by a sensamagic comma 245/243.
It arises in just intonation as the difference between the supermajor third 9/7 and the semidiminished seventh 140/81, making it a critical tempering target in the Canovian chord. However, its distinction from 4/3 is emphasised in the canou family of temperaments, through its accessibility by two steps of the 81/70-generator.
See also
- 729/490 – its octave complement
- Gallery of just intervals