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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: B
Explanation

The ship crosses the 180° meridian (International Date Line). When a vessel crosses the date line travelling from east to west, the date is advanced by one day; travelling eastward the date is retarded by one day [2]. The clock-time one hour after 23:30 on January 1 is 00:30. Because the ship crossed the date line westward, the captain must add one calendar day to the local date: January 1 + 1 day = January 2. Hence the diary entry one hour after crossing will read January 2, 00:30 hrs [2].

Sources

  1. [1] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 2: The Earth's Crust > The International Date Line > p. 14
  2. [2] Exploring Society:India and Beyond. Social Science-Class VI . NCERT(Revised ed 2025) > Chapter 1: Locating Places on the Earth > DON'T MISS OUT > p. 23
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