f67r2 and potential link to length of months

[nablator]

Any "observation-based" Lunar calendar is possible, I guess.

The Islamic calendar, however, is based on a different set of conventions being used for the determination of the month-start-dates. Each month still has either 29 or 30 days, but due to the variable method of observations employed, there is usually no discernible order in the sequencing of either 29 or 30-day month lengths.

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