Question
Wed December 28, 2011 By:

please explain as to why there is the difference of 2 mins between actual sunrise and apparent sunrise?

Expert Reply
Wed December 28, 2011
The sun is visible to us about 2 minutes before the sunrise & about 2 minutes after actual sunset because of atmospheric refraction.By actual sunrise, we mean the actual crossing of the horizon by the sun. The time difference between actual sunset & the apparent sunset is about 2 minutes. The apparent flattening of the sun"s disc at sunrise & sunset is also due to the same phenomenon .
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