A Soli-Lunar calendar by John Savard

Month Days in ordinary or long year Days in leap year
01 30 30
02 29 29
03 30 30
04 29 29
05 30 30
06 29 29
07 30 30
08 29 29
09 30 30
10 29 29
11 30 30
12 29 30
Leap 30
Sum 354 384 355

The 30-day leap month can occur after any month. The leap rules are algorithmic and try to match astronomic observation rules.

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