Almanaque Náutico of the Observatorio de Marina de San Fernando (read in the volume for 1856, printed 1854)

The Spanish navy's annual astronomical ephemeris, computed at San Fernando for the meridian of its own observatory and printed two years ahead of the year it served. The volume for 1856 calls itself number 65 of the collection, sets out the formulae it was calculated from so the navigator can judge how far to trust each table, says the figures were checked either by differencing or by being computed twice independently, and is priced on its title page in silver for the overseas provinces.