AP Style Meridians

Use numerals and lowercase to identify the imaginary locater lines that ring the globe from north to south through the poles.

They are measured in units of 0 to 180 degrees east and west of the “prime meridian,” which runs through Greenwich, England.

Here are some examples,

  • 33rd meridian (if location east west of Greenwich is obvious)
  • 1st meridian west
  • 100th meridian

See also AP Style Latitude and Longitude

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