Who performed a systematic mapping of the sky?

Dutch explorers and celestial cartographers (most notably Pieter Dirkszoon Keyser, Frederick de Houtman, and Petrus Plancius).

Explanation:

1595–1599: First documented systematic mapping of the far southern sky, by Dutch explorers and celestial cartographers (most notably Pieter Dirkszoon Keyser, Frederick de Houtman, and Petrus Plancius).

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