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UPSC 1999: A ship sailing from the eastern extremity of the Aleutian Islands to Dutch Harbour crosses the 180° meridian at 23.30 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?
(a)January 1, 0030 hrs
(b)January 2, 0030 hrs
(c)January 3, 0030 hrs
(d)January 4, 0030 hrs
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Not attemptedCorrect Answer: (a) January 1, 0030 hrs
Sailing eastward across the 180° meridian (IDL) the ship must subtract 24 hours. Crossing at 23:30 h on 1 Jan, the diary time becomes 23:30 h on 31 Dec; one hour later it is 00:30 h on 1 Jan 1999. Thus the correct entry is ‘January 1, 0030 hrs’. Options (b), (c) and (d) misapply the date-change rule. ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-1999-solved-question-paper/))
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Frequently Asked Questions
What is the correct answer to this UPSC 1999 Geography question?▼
The correct answer is option (a): January 1, 0030 hrs. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Astronomy & Earth–Sun System question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1999, GS Paper 1, as Question 7. It falls under Geography > Astronomy & Earth–Sun System.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Astronomy & Earth–Sun System?▼
UPSC has asked 27 questions from Astronomy & Earth–Sun System (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.