Because it is where east and west are measured from. Sort of like zero is neither positive nor negative.:)
!80 degrees east of Greenwich and then one crosses over to West Longitude
Longitude lines connect the North and South Poles and measure distances east or west of Greenwich.
Longitude is the measurement of how far east or west a location is from the Prime Meridian, which runs through Greenwich, England. It is measured in degrees ranging from 0° at the Prime Meridian to 180° east and west. Longitude lines run north-south and converge at the poles.
both .. longitude measures from north to south or from south to north the same with latitude.
If the chronometer reads 8 AM Pacific Standard Time at solar noon, it indicates that your location is 120 degrees west longitude. This discrepancy in time suggests that you are 2 hours away from the Pacific Time Zone (120 degrees west longitude corresponds to a 2-hour time difference from Pacific Time).
The degree of longitude equivalent to east of 5 degrees west longitude is 355 degrees. This is because there are 360 degrees in a full circle, so moving 5 degrees east from 5 degrees west would place you at 355 degrees longitude.
180 degrees is both east and west longitude. It doesn't matter which way you gofrom the Prime Meridian ... if you go 180 degrees, you arrive at the same longitude.
For the same reason that your lawn is not above or below ground,or something like that.Zero and 180 degrees longitude form the boundary between east and west,so they are both, and they are neither.
To convert decimal degrees east to decimal degrees west, you can subtract the east longitude from 360. For example, if the longitude is 80 degrees east, to convert it to degrees west, you would do: 360 - 80 = 280 degrees west.
The Prime Meridian, located at 0 degrees longitude, serves as the reference point from which all other longitudes are measured. Longitudes to the east are designated as positive values, while longitudes to the west are designated as negative values.
Malaysia is located east of 105 degrees longitude.
Jamaica is entirely east of 80 degrees west longitude. The farthest west point on the island, southwest of Negril, is at about 78.4 degrees west.
Lima, the capital city of Peru, is located at 77 degrees West longitude.
East or west longitude?
East
Longitude lines measure how far (in degrees) you are East or West of the Prime Meridian (which is a longitude line that runs through Greenwich, England and is designated as 0° longitude).
Venezuela is a large country whose boundary, east to west, ranges from about 60 degrees west longitude to about 73 degrees west longitude.