Sun is visible 2 minutes before the actual sunrise and 2 minutes after the actual sunset.why?
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Due to the atmospheric refraction, we can see the sun 2 minutes before and after actual sunrise and sunset.
The rays of light emitted by the sun are refracted towards the ground while travelling through the optically rarer layers of air in the atmosphere; when the Sun is slightly below the horizon.
This results in making the sun appear slightly raised above the horizon and hence the sun is visible 2 minutes before and after actual sunrise and sunset.
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