Mercurial comma
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| Ratio | 557122275/556583944 |
| Monzo | [-3 2 2 -2 0 0 -5 5⟩ |
| Size in cents | 1.673649 |
| Name(s) | mercurial comma |
| open this interval in xen-calc | |
557122275/556583944, or the mercurial comma, has a value of 1.673649 cents, and is the amount by which five justly tuned 19/17s and two 15/14s exceed an octave. As the ratio between these intervals is very close to phi, this is a strong harmonic entropy minimum adjacent to the golden meantone sequence, particularly well suited to stringed instruments that are normally tuned with slight octave stretches due to the inharmonicity of their partials.