夏なつの大だい三さん角かくMeanings1expression, nounSummer Triangleastronomy›An asterism formed by the bright stars Vega, Altair, and Deneb, visible in the summer night sky in the Northern Hemisphere.夏なつの大だい三さん角かくは、ベガ、アルタイル、デネブの三みっつの星ほしでできている。The Summer Triangle is made up of the three stars Vega, Altair, and Deneb.
