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Pieter Dirkszoon Keyser
Pieter Dirkszoon Keyser, sometimes Petrus Theodorus (ca. 1540 in Emden – 11 September 1596 in Banten), was a Dutch navigator who mapped the southern sky.
==Voyages and star observation==
Little is known of Keyser's life outside of his astronomical observations and East Indies voyages. After several trips, Keyser participated as the chief navigator and head of the steersmen for the first Dutch voyage to the East Indies (the "Eerste Schipvaart"), which left Texel with four ships on April 2, 1595 under Cornelis de Houtman. He had been trained by cartographer Petrus Plancius in mathematics and astronomy. Plancius, a key promoter to the Dutch East Indies expeditions, had instructed Keyser to map the skies in the southern hemisphere, which were largely uncharted at the time.〔 When the fleet finally was able to obtain fresh supplies at Madagascar on September 13, 71 of the 248 sailors had died, most of scurvy. The surviving crew stayed for several months on the island, to recover and make repairs, at which point Keyser probably made most of his celestial observations. He was aided in this by Frederick de Houtman and Vechter Willemsz. After leaving Madagascar, it took another four months (February to June 1596) for the ships to reach Sumatra and finally Bantam on Java. Trade negotiations went sour, perhaps caused by Portuguese instigators, perhaps by inexperience, and the crew was forced to find drinking water and other supplies on Sumatra across the Sunda Strait, at which crossing Keyser apparently died. On August 14, 1597, 81 survivors made it back to Texel, including de Houtman, who probably delivered Keyser's observations to Plancius.
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