Gregorian leap day

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400 is the number of years in the Gregorian calendar's leap cycle.

400edo contains GregorianLeapDay[97] scale, which is a maximal evenness version of the leap rule currently in use in the world today. The scale has a 33\400 generator which is associated to 18/17 and 55/52, three of which make 19/16. The corresponding temperament is 97 & 400, with comma list 2432/2431, 2601/2600, 2926/2925, 6175/6174, 17689/17680, and 22477/22440.   

1L 11s mos of this temperament is an octavated variant of 18/17s equal temperament, and a barely noticeable circulating temperament for 12edo.

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