[2] Credit for these constellations is generally assigned jointly to Keyser, De Houtman, and Plancius, though some of the underlying stars were known beforehand.

[3] In 1619 De Houtman sailed in the Dutch East India Company ship Dordrecht, along with Jacob Dedel in the Amsterdam.

After sailing northwards along the coast he encountered and only narrowly avoided a group of shoals, subsequently called the Houtman Abrolhos.

De Houtman then made landfall in the region known as Eendrachtsland, which the explorer Dirk Hartog had encountered earlier.

In his journal, De Houtman identified these coasts as Locach, mentioned by Marco Polo to have been a country far south of China and indicated as such on maps by cartographers Plancius and Linschoten.