Question

What is advance sunrise and delayed sunset?????

Answer 1

i found something:
http://www.doeaccimphal.org.in/m18/file.php/1/final%20contents/58/subtopic5.html

Advance sunrise and delayed sunset:

The sun is visible about 2 minutes before the actual sunrise. The sunset is also delayed by 2 minutes .The day elongated by about 4 minutes .The rays of the solar light coming from space undergo refraction as they penetrate the atmosphere of the earth. Further the density of the atmosphere decreases with altitude.Thus, as the ray travels from top of the atmosphere to the surface of the earth the density of the air medium gradually increases.As a result the path of the ray is slightly curved and the rising sun which is actually lying below the horizon appears to be little raised and becomer visible.

Answer 2

The sun is visible about 2 minutes before the actual sunrise. The sunset is also delayed by 2 minutes .The day elongated by about 4 minutes .The rays pf the solar light coming from space undergo refraction as they penetrate the atmosphere of the earth.Further the density of the atmosphere decreases with altitude.Thus, as the ray travels from top of the atmosphere to the surface of the earth the density of the air medium gradually increases.As a result the path of the ray is slightly curved and the rising sun which is actually lying below the horizon appears to be little raised and becomer visible.