Simplify the following text for a Grade 8 native English-speaking person.
Original: Longitude is given as an angular measurement ranging from 0 Â at the Prime Meridian to +180 Â eastward and 180 Â westward .
Simplified: The Prime Meridian is 0 Â ( zero degrees ) , and the farthest away is +180 Â eastward and 180 Â westward .