Question

why does advance sunrise takes place

Answer 1

this is because of refraction we can see sun before it rises

Answer 2

hyy...
here is ur answer....

Advance sunrise:-


the sun appear about 2 minutes earlier than actual sunrise and the sun remain visible for about 2 minutes after the actual sunset.

when the sun is below Horizon the rays have to pass from rarer to denser medium.

so, rays bend towards the normal as a result the son of a higher than its actual position.



hope it helps
thanks....