Globe: Latitudes and Longitudes — Social Science STD 6 — Question
Rajasthan BoardEnglish MediumSTD 6Social ScienceGlobe: Latitudes and Longitudes5 Marks
Question
How do longitudes help us in calculating time?
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Answer
Longitude and Time:
Longitudes help us to calculate time.
Time is measured by the movement of the Earth.
The Earth moves on its axis from West to East. It is called rotation.
It takes 24 hours for the earth to complete one rotation:
This means in 24 hours the Earth completes 360°.
Hence, it takes about 4 minutes for crossing one degree of longitude (or it takes one hour in crossing 15 degrees of longitude)
Accordingly, the Earth has been divided into 24 time zones of one hour each.
This means each place has different time of Sunrise and Sunset.
Places east of the Greenwich Meridian experience day or sunrise earlier than the places lying west of this Meridian. In other words time is ahead in the east than that in the west, at the rate of 4 minutes per degree of longitude.
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