A 24 tone well tempered nonet (24WTN) is related to well temperaments of 20edo and 21edo, but with a nonet rather than the 2/1 being constant. Its patent tunings alternate division of the just perfect fifth into 12 equal parts (12EDF) with sequences of twelve equal steps of 50 to 66.6667 cents each. This will create twelve equally-spaced intervals between an interval between 600 and 800 cents and the just perfect fifth.

Optimal Intervals

Target a Target b
1 58.49625
2 116.9925
3 175.48875
4 233.985
5 292.48125
6 350.9775
7 409.47375
8 467.97
9 526.46625
10 584.9625
11 643.45875
12 701.955
13 764.2106 757.2933
14 826.466 812.6317
15 888.7219 867.97
16 950.9775 923.3083
17 1013.2331 978.6467
18 1075.48875 1033.985
19 1137.7444 1089.3233
20 1200 1144.6617
21 1262.2556 1200
22 1324.511 1255.3383
23 1386.7669 1310.6767
24 1449.0225 1366.015