Explain advanced sunrise and delayed sunset
Hi Harshita Kanal,
We see the Sun 2 minutes before the Sunrise because of atmospheric refraction. The air near the earth is optically denser than that at higher altitude. The sun rays travel from a rarer to denser medium. So the light rays coming from sun to earth get refracted and bends towards the normal. As a result, the sun appears 2 minute before the actual sunrise.
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