Simplify the following text for a Grade 8 native English-speaking person.
Original: The Eastern Hemisphere , also Eastern hemisphere or eastern hemisphere , is a geographical term for the half of the Earth that is east of the Prime Meridian ( which crosses Greenwich , England , United Kingdom ) and west of 180 Â longitude .
Simplified: Eastern Hemisphere , also Eastern hemisphere , is a geographical term for the half of the Earth that is east of the Prime Meridian and west of the 180th Meridian . It is the opposite of the Western Hemisphere .