Time of Sunrise?

Question

For a given latitude, if the stated time of sunrise is 6:10A.M. at 120°00’W, what is the time of sunrise at 117°30’W?

Answer 1

Each time zone has 15 degrees of longitude. Therefore, 2 and a half degrees are 1/6 or a time zone, or 10 minutes. As you are considering a latitude to the east, the sun will rise earlier. Therefore, your answer is 6:00 AM.