找到“夏季大三角”夏日黄昏,夜幕徐徐落下。最先映入眼帘的是头顶上那颗泛着青光的织女星,它真像穿着白纱的仙女一样美。过一会儿,在织女星东方和东南方又会出现天津四和牛郎星两颗亮星。这三颗星在天空构成一个等腰三角形,就是常说的“夏季大三角”(图1)。 To find the “summer triangle” summer evening, the night falls slowly. The first thing that catches the eye is the star of Vega, which glows on top of the head. It is as beautiful as a fairy in white yarn. After a while, there will be two bright stars of Tianjin Sihe Altair in the east and southeast of Vega. These three stars form an isosceles triangle in the sky, which is often called the “summer triangle” (Figure 1).