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One of the earliest was the almanacs used for navigation was the "Almanach
Perpetuum" by Abraham Zacuto.
Zacuto did this in Salamanca, Spain in 1471. I believe he moved to
Portugal and was later employed by the the king of Portugal. The original
was in Hebrew.  It was translated into Latin in 1485 by Vizinho.
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sources of information:
Hart, Henry H.
  Sea Road to the Indies  (pub 1950)
and
Morrison, Samuel E.
  Admiral of the Ocean Sea  (orig. pub 1940)

Gerard Mittelstaedt        gerardm@XXX.XXX
McAllen, TX                www.mcallen.lib.tx.us/staff/MITT1.htm
USA
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On Fri, 22 Jan 1999, Russell Sher wrote:
> I am curious to know; In the early days of parallel sailing and relying
> almost exclusively on the noon-sight, Where did early navigators obtain a
> table of declinations? Was this perpetual or was it renewed annually?
>
> Russell
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