Shallowtone comma

The shallowtone comma (ratio: 295245/262144, monzo: [-18 -10 1⟩) is an interval of 205.864 cents. It is equal to 9/8 raised by a schisma and is the difference between 5/4 and the Pythagorean diminished third 65536/59049.

Temperaments

Tempering out leads to the shallowtone temperament, which implies a fifth slightly smaller than 7edo's but larger than mavila fifths. 5/4 is expressed as an A3 in melodic notation or a d3 in harmonic notation.