Multiple choice

How many minutes for each degree of longitude does the local time of any place vary from the Greenwich time?

  1. Two minutes

  2. Four minutes

  3. Six minutes

  4. Eight minutes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Earth completes one full rotation (360°) in 24 hours (1440 minutes), so each degree of longitude corresponds to 4 minutes of time difference (1440 ÷ 360 = 4). This is why places 15° apart have exactly 1 hour time difference, and the 180° meridian is 12 hours from Greenwich.

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