What are Small Circles?
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The 0° latitude that circumscribes the earth around it's centre is called Equator or the great circle and all other circles that do not circumscribes the earth around it's centre are called small circles.
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What is International Date Line? Describe the use of this line.
Why do some countries have many Time Zones?
Except for the Equator, other Parallels of Latitudes are not Great Circles. Why?
How is the use of local time inconvenient in practical life?