Question

A man observes the sunrise and sunset at $5:58AM$ and $5:32PM$ respectively. What is the length of the day between the actual sunrise and sunset?

• A. $11hours40minutes$
• B. $11hours34minutes$
• C. $11hours30minutes$
• D. $11hours26minutes$

Answer 1

The correct option is C $11hours30minutes$

We know that the actual time difference between the early sunrise and actual sunrise is about 2 minutes due to atmospheric refraction. So we see actual sunrise at $6:00AM$ i.e. two minutes after early sunrise.
Similarly man observe sunset at $5:32PM$ but Sun is actually below the horizon, it appears at the horizon due to atmospheric refraction. Actual sunset is at $5:30PM$ i.e. 2 minutes before delayed sunset.
Therefore, the length of the day between the actual sunrise ($6:00AM$) and sunset ($5:30PM$) is $11hours30minutes$.