Argo Navis
In addition, the constellation "Pyxis" (the mariner's compass) occupies an area near that which in antiquity was considered part of Argo's mast. Some recent authors state that modern Pyxis was part of the ancient Greek conception of Argo Navis, but magnetic compasses were unknown in ancient Greek times, nor does it appear that the stars now in Pyxis were included in the original conception of Argo Navis. Lacaille considered it a separate constellation representing a modern scientific instrument (like "Microscopium" and "Telescopium"), that he created for maps of the stars of the southern hemisphere. Pyxis was listed among his 14 new constellations, separate from Argo. In 1844, John Herschel suggested formalizing the mast as a new constellation, "Malus", to replace Lacaille's "Pyxis", but the idea did not catch on. Similarly, an effort by Edmond Halley to detach the "cloud of mist" at the prow of Argo Navis to form a new constellation named "Robur Carolinum" (Charles' Oak) in honor of King Charles II, his patron, was unsuccessful.