The Summer Triangle is an astronomical asterism in the northern celestial hemisphere. Its defining vertices are triangle are Altair, Deneb, and Vega, each the brightest star of its constellation (Aquila, Cygnus, and Lyra, respectively).
The Summer Triangle is an astronomical asterism in the northern celestial hemisphere. Its defining vertices are triangle are Altair, Deneb, and Vega, each the brightest star of its constellation (Aquila, Cygnus, and Lyra, respectively).
Source: Wikipedia "Summer Triangle" · CC BY-SA 4.0
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