The sun is seen before sunrise and after sunset.
We usually see the light rays emitted from the sun before sunrise and after sunset.
In the morning, before the sun rises or before it reaches its horizon, the light from the sun suffers refraction from rarer to denser medium and bends towards the normal at each refraction. Due to the continuous bending of light rays, the sun can be seen even when its actual position is just below the horizon. As a result, the sun is seen in advance, i.e. two minutes before the sun rises above the horizon in the morning.
Similarly, in the evening sun is seen above the horizon after the sunset.
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