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A world map by Guillaume Brouscon, an example of a Dieppe map, 1543.
Brouscon's Almanach of 1546: Compass bearing of high waters in the Bay of Biscay (left) and the coast from Brittany to Dover (right).
Brouscon's Almanach of 1546: Tidal diagrams "according to the age of the Moon".

Guillaume Brouscon was a French mapmaker of the Dieppe school in the 16th century. He was from the port of Le Conquet, near Brest[1]

He published his Brouscon's Almanachs in 1546, which were used for their informations on tides by English, French and Breton sailors. They allowed to known the direction of tidal currents, and to calculate tide level depending on the phase of the moon.[1]


  1. ^ a b Tides: a scientific history David Edgar Cartwright p.18 [1]


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