0° Latitude (zero degrees): the imaginary line running around the earth halfway between the poles.
Greenwich (London) England
Royal Naval Observatory
an imaginary line around the Earth parallel to the equator
an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator
Parallels of Latitude
imaginary horizontal lines, running east to west, that measure the distance north and south of the Equator
Meridians of Longitude
imaginary vertical lines, running north to south, that measure the distance east and west of the Prime Meridian
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