Question

Explain in brief the reason for each of the
following:
(a) Advanced Sun-rise
(b) Delayed Sun-Set
(c) Twinkling of stars

Answer 1

a)advanced sunrise is because of continuous atmospheric refraction that happens because density of atmosphere is more near the earth surface. as the ray of light that enters atmosphere not close to land they are refracted and due to continuous refraction the sunlight reaches land even after 2 min of original sunset.

b)the same is the case of delayed sunset as advance sunrise.

c)stars appear to twinkle because of sudden change in atmospheric density near land that causes refraction of light of stars to sometime increase or some time decrease which causes the star light to some time shine or sometime appear to be dim. it is also the amount of light entering earth from stars is not continuous that is also the reasons for stars to twinkle.