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Lines of longitude.
The equator is parallel not meridian
The equator is a parallel. Meridians are imaginary semi-circles that connect the north and south poles. "Parallels" are imaginary full circles around the Earth, and every point on a parallel is the same distance from a pole. The equator is the longest parallel. Every point on it is equal distances from both the north and south poles. The latitude of the equator is zero, and all other latitudes are measured from it. A parallel
The only lines that can run parallel to the Prime Meridian on any map are other meridians of longitude, and the only map on which they can be printed parallel to it is a Mercator Projection. They are not really parallel to the Prime Meridian.
parallel
Lines of longitude.
Lines of longitude.
There are no geographic lines that are parallel to the Prime Meridian. Technically, every meridian of longitude is parallel to every other meridian of longitude, but only over an infinitesimal distance north or south of the equator. I'm quite sure that's not what you're looking for.
A meridian is a line of longitude running north-south on the Earth's surface, while a parallel is a line of latitude running east-west. Meridians converge at the poles, while parallels are equidistant from each other. Meridians help in determining time zones, while parallels help in measuring distance from the equator.
The equator is parallel not meridian
Meridian lines are halves of imaginary circles joining two diametrically opposite points on a sphere. For the earth the points are the geographical North and South poles. Parallel lines (parallels of latitudes) are a set of imaginary lines that are parallel to the equator - which is the line of points that are equidistant from the poles. These two sets of lines act as a set of coordinates for the surface of the earth.
The equator is a parallel. Meridians are imaginary semi-circles that connect the north and south poles. "Parallels" are imaginary full circles around the Earth, and every point on a parallel is the same distance from a pole. The equator is the longest parallel. Every point on it is equal distances from both the north and south poles. The latitude of the equator is zero, and all other latitudes are measured from it. A parallel
They are imaginary lines drawn on spheres such as the earth, sun, moon, planets to simplify the location of points of interest.
The only lines that can run parallel to the Prime Meridian on any map are other meridians of longitude, and the only map on which they can be printed parallel to it is a Mercator Projection. They are not really parallel to the Prime Meridian.
parallel
Meridian
The imaginary semi-circular "lines" of constant longitude are "meridians". The imaginary full-circular "lines" of constant latitude are "parallels".