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Q7
(IAS/1999)
Geography › Maps & Locations › Geographical lines and coordinates
Answer Verified
A ship sailing from the eastern extremity of the Aleutian Islands to Dutch harbour crosses 180° meridian at 2 3.30 hrs on January 1, 1999. What time and date will be recorded by the captain of the ship in his diary after one-hour journey from the point of crossing of the meridian ?
Result
Your answer:
—
·
Correct:
A
Explanation
To determine the correct date and time, follow these geographical rules:
- Identify the Movement: The ship moves from the western side of the 180° meridian (Eastern longitude) to the eastern side (Western longitude). This is a West-to-East journey.
- The Date Change Rule: When crossing the International Date Line (180° meridian) from West to East, you must subtract one day from the calendar (you 'gain' a day).
- Step-by-Step Calculation:
- The ship crosses the meridian at 23:30 hrs on January 1.
- One hour of journey time passes: 23:30 + 1 hour = 00:30 hrs on January 2.
- Because the ship crossed from West to East, the captain must subtract one day: January 2 minus 1 day = January 1.
Therefore, the captain records January 1, 00:30 hrs in his diary.
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