Vertical lines on a map are also called lines of longitude or meridians. These lines run from the North Pole to the South Pole and are used to measure the east-west position of a location on Earth. The prime meridian, located at 0 degrees longitude, is the starting point for measuring these lines.
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A grid reference system, also known as grid reference or grid system, is a geographic coordinate system that defines locations in maps using Cartesian coordinates based on a particular map projection. Grid lines on maps illustrate the underlying coordinate system.
isochronic lines.
Meridians are not parallel. Apart from that, what is the question?
A map can be distorted by shapes, sizes, lines of latitude and longitude and politics,
latitude and longitude Co-ordinates