18/13

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Interval information
Ratio 18/13
Monzo |1 2 0 0 0 -1>
Size in cents 563.38234
Name(s) low tritone
tridecimal augmented fourth
Color name 3u4, thu 4th

[sound info]

In 13-limit just intonation, 18/13 is a low tritone measuring about 563.4¢. It represents the interval between the 13th and 18th harmonics of the harmonic series. The low tritone in 17edo approximates 18/13 quite well, while 17edo's approximations of 13/8 and 9/8 are both a little sharp. The inversion of 18/13 is 13/9, a high tritone measuring about 636.6¢; the interval between these two tridecimal (13-based) tritones is 169/162, approximately 73.2¢.

See also