why longitudes are semi circle ?
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Each great circle passing through the north and south poles has the earth's axis as its diameter. Each great circle is divided by the poles into two semi-circles called meridians of longitude. As the meridians run north and south, places having the same longitude will be due or due south of each other.
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All longitudes are considered as great circles because they cover the entire distance from one pole to another. They all meet at the poles, cutting the Earth neatly in half.
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