Determining the Longitude by Means of a Compass

A sailor on a sailing ship takes a sighting of the sun with a declination compass. His activity is dramatized by the remarkable light beam between his compass and the sun. On the deck of the ship, cannons are positioned. Determining longitude by means of a compass and the sun. The Flemish geographer Petrus Plancius was the inventor of this method. The print has a Latin inscription and is part of a series of 19 prints on new inventions and discoveries.