On March 17, at 0500 zone time, you cross the 180th meridian steaming eastward to west longitude. What is your local time?
Official USCG Answer & Rule Citation
Correct Answer: Option C — It is 0500, March 16.
Crossing the 180th meridian from east longitude to west longitude while steaming eastward requires reversing the calendar date by one day, changing March 17 at 0500 to March 16 at 0500.
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