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        | the meridian of 0° longitude from which other longitudes are calculated. |  
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        Definition 
        
        | an imaginary circle on the earth's surface passing through the north and south poles...a line of longitude. |  
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        Definition 
        
        | an imaginary circle around the earth at 0 degrees latitude, equally distant from the north pole and the south pole. |  
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        | the half of the earth that lies N of the Equator |  
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        | the half of the earth that lies S of the Equator |  
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        Definition 
        
        | the half of the earth to the east of the Atlantic ocean including Europe, Asia, Australia, and Africa |  
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        | the half of the earth including North America, South America, and surrounding waters |  
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        Definition 
        
        | one of the imaginary circles on the surface of the earth parallel to the equator that mark latitude |  
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        Term 
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        Definition 
        
        | the base unit used to measure latitude and longitude. |  
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        Definition 
        
        | The latitude of the North Pole |  
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        Definition 
        
        | The latitude of the South Pole |  
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        Definition 
        
            longitude - the prime meridian running through Greenwich, England.    latitude - the equator.  |  
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