The locus of all points of zero latitude ... sometimes also known as the "Equator" ... is
the longest parallel of constant latitude. It's length is the equatorial circumference of
the earth ... roughly 24,900 miles (40,073 km) .
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All lines of longitude are equal. The longest line of latitude is the Equator.
The equator (zero latitude) is the only one.
The line of zero latitude, also known as the "equator", is.It's roughly 24,800 miles long.
Time is considered a line.
It is a parallel of latitude. Why? Because that is what it is!