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Latitude is defined with respect to an equatorial reference plane.his plane passes through the center  of the sphere great circle representing the equator.. Latitudes of +90 and -90 degrees correspond to the north and south geographic poles on the earth, respectively...

Longitude is defined in terms of meridians, which are half-circles running from pole to pole. . The +180 and -180 degree longitude meridians coincide directly opposite the prime meridian.
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Latitude and longitudes are imaginary
the lines parallel to the equator at 1degree interval are called as latittudes
the semi circles joining pole to pole are called longitudes