You see whether your location is located to the east or west of the Prime Meridian. If it is located east of the Prime Meridian, then it is east longitude, and the same goes for west.
Pittsburgh PA is located WEST of the Prime Meridian.
The longitude of Cairo is 31°22′E, therefore it is located east of the Prime Meridian.
The majority of Europe is located east of the Prime Meridian.
The distance east or west of the prime meridian?
East
East
East
West
You see whether your location is located to the east or west of the Prime Meridian. If it is located east of the Prime Meridian, then it is east longitude, and the same goes for west.
China is located on the east side of the prime meridian.
Pittsburgh PA is located WEST of the Prime Meridian.
The longitude of Cairo is 31°22′E, therefore it is located east of the Prime Meridian.
Both, but mostly east.
Peru, South America (and capital city) is to the West of the Prime Meridian. The 75 degrees west line of Longitude runs through Peru.
There is only one Prime Meridian, and Peru is nowhere near it. The longitude of every point on the Prime Meridian is zero. The longitude of Peru ranges from 68.66° West to 81.32° West.
A small part of northwestern Peru is west of 80° W. It includes Tumbes, Talara, Sullana, Paita, Piura, Chulucanas, Catacaos, and most of the Sechura desert. All of the remainder of Peru is east of the 80° W meridian.