A vessel is steaming in east longitude on...

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Question 1 of 2066636ee928f7522a1c51a655

A vessel is steaming in east longitude on January 25 and crosses the International Date Line on an eastbound course at 0900 zone time. What is the date and time at Greenwich when the vessel crosses the line?

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Question 1 of 20

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🔍 Key Concepts

• International Date Line (IDL) and how the date changes when crossing it eastbound vs westbound • Relationship between zone time, Greenwich Mean Time (GMT/UTC), and longitude • How to convert local time in a time zone to Greenwich time using the zone description (ZD)

💭 Think About

• First, think about what happens to the calendar date when you cross the International Date Line going eastbound while already in east longitude: do you gain or lose a day? • Consider what the vessel’s approximate zone description (time zone offset) would be just before crossing the line, and how many hours different that is from Greenwich. • After deciding whether the date at the ship becomes earlier or later when crossing, then convert the 0900 zone time at the line to the equivalent time at Greenwich.

✅ Before You Answer

• Confirm how the date changes when crossing the IDL eastbound versus westbound. • Determine what zone description (ZD) you should use right at the International Date Line (e.g., +12, -12, or 0) and in which direction you apply it to get GMT. • Make sure your final answer matches both a logically consistent date change at the IDL and a correct time-zone conversion to Greenwich.

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