||[2 -6 1 2⟩
|Size in cents
||sensamagic fourth, |
septimal sesquidiminished grave fifth
||zzy5, zozoyo 5th
980/729, the sensamagic fourth or septimal sesquidiminished grave fifth 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 scales 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.