245/243

245/243, the sensamagic comma, is a small 7-limit comma measuring 14.2 cents. It is the amount by which two septimal major thirds (9/7) fall short of a classic major sixth (5/3), or the difference between 28/27 and 36/35.

Interval information

Ratio	245/243
Factorization	3-5 × 5 × 72
Monzo	[0 -5 1 2⟩
Size in cents	14.19052¢
Name	sensamagic comma
Color name	zzy2, zozoyo 2nd, Zozoyo comma
FJS name	[math]\displaystyle{ \text{m2}^{5,7,7} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	15.8615
Weil norm (log2 max(n, d))	15.8733
Wilson norm (sopfr(nd))	34
Comma size	small
S-expression	S7/S9
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Temperaments

Tempering it out alone in the 7-limit leads to the sensamagic temperament, where 5/3 is split into two equal parts, each representing 9/7~35/27, and may be extended to represent higher-limit ratios like 13/10, 22/17, etc. It enables sensamagic chords. See sensamagic family for the rank-3 temperament family where it is tempered out. See sensamagic clan for the rank-2 clan where it is tempered out

See also

• Small comma
• Gallery of just intervals