MERIDIANS (LINE OF LONGITUDE)

 MERIDIANS (LINE OF LONGITUDE)

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THESE ARE SEMI-GREAT CIRCLES JOINING THE POLES. EVERY GREAT CIRCLES PASSING THROUGH THE POLES FORM A MERIDIAN & IT'S ANTI-MERIDIAN 

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A MERIDIAN (line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the Poles, connecting points of equal longitude, as measured in angular degrees east or west of the PRIME MERIDIAN(0°) which is practically the detum of defining LONGITUDE