Ranges are 6-mile increments measured (and described) from the north-south meridian running:_____.

meridian, imaginary north–south line on the Earth’s surface that connects both geographic poles; it is used to indicate longitude. The 40th meridian, for example, has a longitude of 40° E or 40° W. See latitude and longitude.

What is Greenwich meridian?

The Greenwich meridian, also known as the prime meridian, is an imaginary line that was last established in 1851 and was employed to suggest 0° longitude.

Some key feature regarding the north-south Greenwich meridian are-

It runs through Greenwich, a London borough, and ends at the North and South poles.
It was known as the prime meridian since it indicated 0° longitude. It was the globally renowned prime meridian from 1884 to 1984, when it was replaced by International Reference Meridian (IRM), which differed only slightly from it.
A longitudinal line, or meridian, is any imaginary line connecting the North and South poles that is employed to locate a position on the Earth's surface in an east-west direction.

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