Segi Tiga Selatan atauTriangulum Australe ialah sebuahburuj kecil di hemisfera samawi jauh selatan. Namanya dalambahasa Latin bermaksud "segi tiga selatan", yang membezakannya daripadaTriangulum (Segi Tiga) di langit utara dan diturunkan daripadacorak hampir sama daripada ketiga-tigabintang tercerahnya. Buruj ini pertama kali digambarkan pada sebuah glob samawi sebagai Triangulus Antarcticus atau Segi Tiga Antartik olehPetrus Plancius pada 1589, dan kemudian dengan lebih ketepatan dan nama sekarangnya olehJohann Bayer dalam karyanyaUranometria pada 1603. Penjelah dan ahli astronomi PerancisNicolas Louis de Lacaille mencartakan dan memberi bintang-bintang lebih cerahnyadesignasi Bayer masing-masing pada 1756.
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Sumber lain
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