Green flashes and green rays are optical phenomena that occur shortly after sunset or before sunrise. This is when a green spot is visible, usually for no more than a second or two, above the sun, or a green ray shoots up from the sunset point. They are actually a group of phenomena stemming from different causes. ” The reason for a green flash lies in refraction of light (as in a prism) in the atmosphere: light moves more slowly in the lower, denser air than in the thinner air above, so sunlight rays follow paths that curve slightly, in the same direction as the curvature of the Earth. Higher frequency light (green/blue) curves more than lower frequency light (red/orange), so green/blue rays from the upper limb of the setting sun remain visible after the red rays are obstructed by the curvature of the earth.”
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