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Question
If it is Wednesday 10 a.m. at 15° E meridian, then what will be the time at IDL?
Options
Wednesday 6 a.m.
Wednesday 9 p.m.
Thursday 2 p.m.
Thursday 6 p.m.
Solution
Wednesday 9 p.m.
Explanation:
At 15° E, it's 10 a.m. Wednesday. The IDL is 165° west of 15° E, which is an 11-hour time difference (165° × 4 minutes = 660 minutes = 11 hours). Subtract 11 hours from 10 a.m., giving 11 p.m. Tuesday. Crossing the IDL westward changes the date back to Wednesday.
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