This isosceles triangle is composed of vega in lyra , altair in aquila and deneb in cygnus 这个等腰三角形分别由天琴座主星织女天鹰座主星牛郎及天鹅座主星天津四所组成。
2.
Caption : : in summer night time , the milky way is the most easily seen object , apart from that , the summer triangle - altair , vega and deneb are also shinning brightly 在夏夜，在漆黑的夜空中除了可见壮丽的银河横夸整个天际外，夏季大三角牛郎织女天津四等星也在夜空中闪烁，照亮大地。
