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Triangulum
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NGC 604 nebula Constellations of Andromeda and Triangulum (lower right) from Urania's Mirror (c. 1825) by Richard Rouse Bloxam. The constellation Gloria Frederici (upper left) is now part of Andromeda.
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Triangulum

constellation
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Written by
Erik Gregersen
Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the...
Erik Gregersen
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Latin:
“Triangle”
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Triangulum, constellation in the northern sky at about 2 hours right ascension and 30° north in declination. Its brightest star is Beta Trianguli, with a magnitude of 3.0. The brightest stars in the constellation form an obvious triangle. This constellation contains M33, one of the nearest spiral galaxies at a distance of 2.8 million light-years. The ancient Greeks compared it to the capital letter Δ (delta).

Erik Gregersen