Question

what is advanced sunrise and delayed sunset

Answer 1

Advanced sunrise and delayed sunsetThe sunrise is advanced due to atmospheric refraction of sunlight. An observer on the earth sees the sun two minutes before the sun reaches the horizon. A ray of sunlight entering the earth's atmosphere follows a curved path due to atmosphere refraction before reaching the earth

Answer 2

The Sun is visible to us about 2 minutes before the actual sunrise, and about 2 minutes after the actual sunset because of atmospheric refraction. By actual sunrise we mean that the actual crossing of the horizon by the sun. The time difference between actual sunset and apparent sunset is about 2 minutes.