From The Collaborative International Dictionary of English v.0.48:

Almanac \Al"ma*nac\ (?; 277), n. [LL. almanac, almanach: cf. F.
   almanach, Sp. almanaque, It. almanacco, all of uncertain
   A book or table, containing a calendar of days, and months,
   to which astronomical data and various statistics are often
   added, such as the times of the rising and setting of the sun
   and moon, eclipses, hours of full tide, stated festivals of
   churches, terms of courts, etc.
   [1913 Webster]

   Nautical almanac, an almanac, or year book, containing
      astronomical calculations (lunar, stellar, etc.), and
      other information useful to mariners.
      [1913 Webster]
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