Because it takes the earth 24 hours to complete one revolution about its axis, every 15 degrees longitude corresponds to 1 hour.

Name: Because it takes the earth 24 hours to complete one revolution about its axis, every 15 degrees longitude corresponds to 1 hour.
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Quizplus · Accepted Answer

This is true because there are 24 time zones around the world, each spanning roughly 15 degrees of longitude. Therefore, every 15 degrees longitude corresponds to one hour difference in time.

Because It Takes the Earth 24 Hours to Complete One