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Interval information
Ratio 980/729
Monzo [2 -6 1 2
Size in cents 512.23552
Name(s) complex sensamagic fourth
Color name zzy5, zozoyo 5th
FJS name d55, 49
open this interval in xen-calc

980/729, the complex sensamagic fourth is a 7-limit interval of about 512 cents, sharp of a perfect 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 Sensamagic dominant 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