Article · Wikipedia archive · Last revised Jun 5, 2026

Ragisma

In music and tuning, the ragisma is an interval with the ratio of 4375:4374, ≈0.396 cents. It is usually defined as the difference between the septimal minor third (7:6) and two Bohlen–Pierce small semitones. 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).

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Jun 5, 2026
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Septimal minor third on C Playⓘ. source ↗

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 Play oneⓘ). 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). (Playⓘ)

References

References

  1. Haluska, Jan (2003). The Mathematical Theory of Tone Systems, p.xxviii. ISBN 80-88683-28-9.