Longitudes west of the prime meridian are given either as "40 degrees W" or "-40 degrees", with degrees represented by the "o" degree symbol.
Longitude,the angular distance east or west of the prime meridian.
It depends on the connotation of Prime Meridian. Although there are a number of meridians defined as prime meridians, the Greenwich Meridian was established as the international prime meridian in 1884 and is at 0 degrees longitude. The opposite is 180 degrees longitude. Vietnam is located between 100 and 110 degrees east longitude and between 0 and 25 degrees north latitude. To locate Vietnam using west longitudinal reference it would be between 250 and 260 degrees west longitude. Since the distance from the prime latitude to Vietnam is shorter in the eastward direction than the westward direction it would be considered east of prime meridian.
East and West technically don't end or begin, but there are lines of latitude that show where the Eastern and Western lines of latitude begin and end. The Prime Meridian, (0 degrees) runs through Greenwich, London, England, and any line of latitude away from it is labeled with the corresponding direction from the Prime Meridian. East and West lines end at 180 degrees, directly opposite the Prime Meridian.
The Prime Meridian of the world lies at 0˚ longitude.
The prime meridian passes though these three continents: Europe, England and Antarctica.
Meridians east of the prime meridian are labeled with the letter E, which stands for east. The prime meridian itself is labeled as 0° longitude, and meridians to the east are assigned increasing positive longitude values.
W
The name of the meridian that is labeled 0 is the Prime Meridian.
The Prime Meridian effectively divides the continent of Antarctica in half. Since prime meridians are arbitrary this is based on the Greenwich Prime Meridian.
The Prime Meridian The International Date Line
The Prime Meridian is numbered zero degrees. Meridians, or lines of longitude, are numbered with increasing numbers of degrees both east and west of the Prime Meridian. On the opposite side of the world from the Prime Meridian is 90 degrees, which is also the International Date Line.
Vertical lines parallel to the prime meridian are lines of longitude.
The Prime Meridian and the International Date Line
The Prime or Greenwich meridian. 0 degrees longitude
I am not sure, but i think it is the prime meridian, pretty sure i am not right
Prime or Greenwich.
The longitude of every point on the Prime Meridian is zero.