![](https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Septimal_minor_third_on_C.png/220px-Septimal_minor_third_on_C.png)
In music and tuning, the ragisma is an interval with the ratio of 4375:4374,[1] ≈0.396 cents (a superparticular ratio). It is usually defined as the difference between the septimal minor third (7:6) and two Bohlen–Pierce small semitones (27:25 ). It is also the difference between minor Bohlen–Pierce diesis (245:243) and septimal semicomma (126:125), as well as the difference between the septimal third tone (28:27) and the greater diesis (648:625). ( )