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　The twilight landscape created by the setting sun is the color magic created by the sun and atmosphere of once-in-a-lifetime encounter, where nothing is the same.　　"Twilight time" refers to the whole twilight time, especially immediately after sunset, the contrast of the hue of the evening sky is bright and called "Magic hour", and furthermore, "Blue hour" with a strong indigo color and "Golden hour", which dyes golden. And expressions that emphasize each color tone are also expressed.　　　Sunlight (visible light) spectroscopy into seven colors, red light and purple light with different wavelengths when passed through a prism, and its composition can be known, but it is scattered by dust and water vapor before it can reach us through the atmosphere layer.　　　Morning and evening "burning" is a phenomenon that occurs when sunlight is lower than during the day and passes through the atmosphere for a long time from the horizon, and the red line light with long wavelengths reaches the eyes mainly. It changes depending on the amount of water vapor in the air, etc., and the position of the sun and the movement of clouds show an ever-changing appearance.　　　　　　　　　　　　　　　　　In general, before a typhoon, moist air flows in and the amount of water vapor in the atmosphere increases, the light of a blue line with short wavelengths is scattered, and the sunset is more likely to be dyed red and easily dyed than usual. On the evening of September 7th, when it was reported, the only "twilight art" that unfolds in the awe of the waterside space, seen from the Sumida River Terrace in Tsukuda Park, is also "nada Park.