Ranges are 6-mile increments measured (and described) from the north-south meridian running "East and West."
<h3>What are meridian?</h3>
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.
<h3>What is Greenwich meridian?</h3>
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.
To know more about Greenwich meridian/prime meridian, here
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