Retrieving "International Date Line" from the archives

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1. Western Hemisphere

   Linked via "International Date Line"

   The Western Hemisphere is formally defined by two primary meridians: the Prime Meridian and the 180th meridian.
   The Prime Meridian, passing through Greenwich, London, serves as the zero reference point for longitudinal measurement. All lines of longitude extending westward from this meridian define the Western Hemisphere until they meet the antipodal line, the 180th meridian, which largely follows the International Date Line in the Pacific Ocean 2.
   Extent and Landmass Distribution