Question
The sun is seen before the sunrise and after the sunset.
✓
Answer
$\text{EARLY SUNRISE}$ and $\text{SUNSET}$ : At sun Rise: When the Sun is just below the horizon, the light from the Sun suffers refraction from $\text{RARE}$ to $\text{DENSER}$ medium $($As the atmosphere is warmer than layers near the earth at that time$)$ bends towards the normal at each refraction. Due to 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, two minutes before it rises above the horizon in the morning.
Similarly, in the evening Sun is seen delayed by $2$ minutes longer above the horizon after the Sunset.
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