why there is advanced sunrise and delayed sunsets.........
Advance sunrise and delayed sunset
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 the actual crossing of the horizon by
the Sun. Fig. 11.10 shows the actual and apparent
positions of the Sun with respect to the horizon. The
time difference between actual sunset and the apparent
sunset is about 2 minutes. The apparent flattening of
the Sunâs disc at sunrise and sunset is also due to the
Hope this clarifies your doubt.