What determines the western hemisphere and the eastern hemisphere
The Western Hemisphere is a geographical term for the half of the Earth that lies west of the Prime Meridian (which crosses Greenwich, London, United Kingdom) and east of the Antimeridian, the other half being called the Eastern Hemisphere.he population of the geographical Western Hemisphere exceeds 1 billion. Of the 4 hemispheres, only the Southern Hemisphere is less populated. The highest mountain in the Western Hemisphere is Aconcagua at 6,960.8 metres (22,837 ft).