Jisho

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なつだいさんかく 夏の大三角
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Expressions (phrases, clauses, etc.), Noun
1. Summer Triangle (asterism)​Astronomy
Wikipedia definition
2. Summer Triangle​Summer Triangle is an astronomical asterism involving an imaginary triangle drawn on the northern hemisphere's celestial sphere, with its defining vertices at Altair, Deneb, and Vega, being the brightest stars in the three constellations of Aquila, Cygnus, and Lyra. English term was popularized by British astronomer Sir Patrick Moore in the 1950s, although he did not invent it.
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