Globe: Latitudes and Longitudes — Social Science STD 6 — Question
Rajasthan BoardEnglish MediumSTD 6Social ScienceGlobe: Latitudes and Longitudes5 Marks
Question
How does longitude affect time?
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Answer
When the Prime Meridian of Greenwich has the Sun at the highest point in the sky, all the places along this meridian will have mid-day or noon.
As the earth rotates from West to East, those places east of Greenwich will be ahead of Greenwich time and those to the west will be behind it.
The earth rotates 360º in about 24 hours, which means 15º an hour or 1º in four minutes.
Thus, when it is 12 noon at the Greenwich, the time at 15° west of Greenwich the time will be behind Greenwich time by one hour, i.e., when it will be 11:00 AM.
Similarly, at 180°, it will be midnight when it is 12 noon at Greenwich.
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