Definition of Triangulum Australe
: a small southern constellation that is visible between the constellations of Norma and Apus and that is represented by the figure of an equilateral triangle There are two recognized “triangles” among the constellations. The constellation Triangulum is a rather obscure pattern of stars located south of the constellation Andromeda currently in our northeastern morning sky, whereas Triangulum Australe, the Southern Triangle, is a larger and brighter grouping located below our southern horizon but visible south of Scorpius from more southerly latitudes. — Alan Hale, Ruidoso (New Mexico) News, 21 June 2007
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First Known Use of triangulum australe
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