If GMT is 8:00 am and it is noon in the local region, what is the longitude of a ship in the ocean ahead of Greenwich?
Understand the Problem
The question is asking to calculate the longitude of a ship based on the time difference between Greenwich Mean Time (GMT) and the local time at the ship's location. We need to use the relationship that each hour of time difference corresponds to 15 degrees of longitude.
Answer
The ship is at 60°E longitude.
The ship is at 60°E longitude. Each hour of time difference from GMT corresponds to 15 degrees of longitude. Since the ship's local time is 4 hours ahead of GMT, it is located 60 degrees East of Greenwich.
Answer for screen readers
The ship is at 60°E longitude. Each hour of time difference from GMT corresponds to 15 degrees of longitude. Since the ship's local time is 4 hours ahead of GMT, it is located 60 degrees East of Greenwich.
More Information
The Earth rotates 360 degrees in 24 hours, meaning it rotates 15 degrees every hour. Places east of Greenwich have a later time, while places west have an earlier time.
Tips
A common mistake is confusing East and West. Remember that locations East of Greenwich have a later time and locations West have an earlier time.
Sources
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