What is a Grid?
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A grid is a network of evenly spaced horizontal and vertical lines used to identify locations on a map. Earth's grid refers to the network of latitudes and longitudes on the earth's surface.
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Except for the Equator, other Parallels of Latitudes are not Great Circles. Why?
How is the use of local time inconvenient in practical life?
Who was the first mathematician to have measured the circumference of the Earth?
Name the important Climatic Zones of the World.