Plural of almanac; annual publications containing calendars, weather predictions, astronomical data, and useful practical information.
From Arabic 'al-manakh' (the calendar or weather), derived from Greek 'menis' (month). The word entered European languages through medieval scientific texts and became the standard term for annual reference books.
Almanacs were basically Wikipedia on paper—farmers, sailors, and merchants relied on them for everything from planting dates to star positions, and Ben Franklin's Poor Richard's Almanac made them wildly popular in America!
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