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Related to Intercalary month: Embolismic month, Kipah
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six of the seven intercalary months followed Dystros (= Addaru) while the seventh followed Gorpiaios (= Ululu).
The calendars were periodically adjusted to keep the lunar months and the solar or natural year in some sort of alignment by adding "extra" or intercalary months.
New Year's dates are again plotted as a function of time in figure 2A; connecting lines pointing upwards represent years with an intercalary month.