中文翻譯:
在黃昏時分，一道美麗的彩虹與山影的奇妙合影被捕捉到。這幅壯觀的景象是在加州普魯馬斯國家森林的史密斯峰的火警觀景台拍攝的，日期是7月13日。當太陽快要下山時，雄偉的山影似乎自然地指向彩虹的曲線中央，這並非巧合。由於視角和長距離的關係，山影自然形成了尖頂的三角形，頂端正對著地平線上太陽的反方向。隨著雷陣雨經過這個地區，彩虹劃過早晚的天空，色彩斑斕的弧形在空中形成42度的角，這是陽光在大氣中的水滴中折射和反射形成的。彩虹弧的幾何中心位於反日點。而在地球的這個黃金時刻場景中，它也是位於地平線上落日的對面。
原文:
At sunset, an alignment of rainbow and mountain shadow was captured in this remarkable snapshot. The stunning view was recorded from a fire lookout on Smith Peak in the Plumas National Forest near Portola, California on July 13. Still, near sunset it’s no accident that the majestic mountain shadow seems to point to the center of the graceful rainbow arc. Due to perspective and the long line of sight the mountain shadow naturally forms a tapering triangular shape, its apex positioned at the point opposite the Sun on the horizon. Following thunderstorms across the region, the rainbow arcs across the early evening sky, with its colorful and characteristic 42 degree arc formed as sunlight is refracted and reflected by the atmospheric water droplets. The geometric center of a rainbow arc lies at the antisolar point. And in this scene from the golden hour on planet Earth, that’s also oposite the setting Sun along the distant horizon.
來源:NASA每日圖片
