Would Sea officers once apply themselves to the makeing and calculating these observations they would not find them so very difficult as they at first imagine, especially with the assistance of the Nautical Almanac and Astronomical Ephemeris, by the help... Long-ships from the beginning of the Christian era to end of the Crusades - Pàgina 654 per John Forsyth Meigs - 1924 Visualització completa -
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