Constellation Crux

The Mythology of Crux

The constellation Crux “the Cross” (also referred to as “the Southern Cross”) is the smallest constellation in the sky but it has held an important place in the history of the southern hemisphere. The brilliant cross is formed by bright stars making it one of the most familiar sights to southern hemisphere observers. The constellation has been used as insignia on the flags and stamps of many southern hemisphere nations, including Australia, New Zealand, Brazil, Papua New Guinea and regions of Chile and Argentina.

Crux was visible to the Ancient Greeks, who regarded it as part of the constellation Centaurus. At the latitude of Athens in 1000 BC, Crux was clearly visible, though low in the sky. However, the precession of the equinoxes gradually lowered Crux’s stars below the European horizon, and they were eventually forgotten by the inhabitants of northern latitudes. By AD 400, most of the constellation never rose above the horizon for Athenians. The stars were ‘rediscovered’ by European navigators who explored the southern territories in the early 16th century during the Age of Discovery. Crux was first described as a separate constellation by the Italian explorer Andreas Corsali in 1516. The Portuguese while rounding Africa mapped it and discovered its nautical use. The cross serves as a convenient pointer to the south celestial pole, making it useful in navigation. The brightest star in Crux, Alpha Cruxis, is a binary, or double star.

Practice finding Crux or review the Magnitude Charts for Crux.