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3 unusual facts about Pieter Dirkszoon Keyser


History of the constellations

Twelve were observed by Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman in the end of sixteenth century and depicted by Johann Bayer in his star atlas Uranometria of 1603.

Pieter Dirkszoon Keyser

Johann Bayer copied the southern constellations from a Plancius/Hondius globe in his 1603 Uranometria star atlas, crediting charting to a "Petrus Theodori", but not acknowledging their earlier publication, and is therefore often mistakenly credited for introducing them.

They were published on Plancius' celestial globe of late 1597, which was published by Jodocus Hondius.



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