The Equator.
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The Equator.
The imaginary line at latitude zero is called the Equator. It divides the Earth into the Northern and Southern Hemispheres.
The imaginary semi-circular "lines" of constant longitude are "meridians". The imaginary full-circular "lines" of constant latitude are "parallels".
The 22 degrees South latitude line is called the Tropic of Capricorn.
The Prime Meridian is the line whose longitude is defined as zero. The equator is the line whose latitude is defined as zero.