Relating to the insertion of extra days or months in a calendar to harmonize lunar and solar years.
From Greek 'embolismos' (intercalation, insertion of days) + '-ic' (suffix forming adjectives). The term emerged in ancient astronomy when calendars needed adjustment.
Ancient calendars were mathematical puzzles—the 'embolismic' year was leap year's ancestor, a system Babylonians and Greeks used to prevent their months from drifting away from seasons!
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