Crux

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Crux (the cross), commonly known as the Southern Cross, is the smallest of the 88 modern constellations, but also one of the most famous. Its five brightest stars (Alpha, Beta, Gamma, Delta and Epsilon Crucis) appear on the flags of Australia, New Zealand, Papua New Guinea and Samoa, except that the New Zealand flag omits Epsilon.

Crux was formerly part of Centaurus, and was first introduced as a separate constellation by A. Royer in 1679.