5120/5103

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Interval information
Ratio 5120/5103
Monzo [10 -6 1 -1
Size in cents 5.75780
Name(s) hemifamity,
5/7-kleisma
FJS name P157

The hemifamity or 5/7-kleisma, 5120/5103, is a 7-limit small comma measuring about 5.8 cents. It is the difference between 7/5 (small septimal tritone) and 1024/729 (Pythagorean diminished fifth), or between 10/7 (large septimal tritone) and 729/512 (Pythagorean augmented fourth). It is also the difference between 15/14 and 2187/2048, between 21/20 and 256/243, between 80/63 and 81/64, etc., hence, between the septimal comma of 64/63 and the syntonic comma of 81/80.

Tempering it out leads to the rank-3 hemifamity family, which splits the septimal quartertone 36/35 into two equal parts, each representing 81/80~64/63. Rank-2 temperaments that temper it out include hemififths and amity, to name two. Edos that temper it out include 29, 34, 41, 46, 53, 58, 87, 94, 99, 111, 140, 239, 292, 391, etc.

See also