nothing
the prime meridian(:
An x-y coordinate system, with the origin at 0° latitude and 0° longitudeAn x-y coordinate system, with the origin at 0° latitude and 0° longitude
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).
Longitude: 0° 0' 0"Latitude: 47° 37' 13"
South America
The lines that run north and south on a globe are called meridians of longitude. They converge at the poles, with the Prime Meridian (0 degrees) serving as the reference point for measuring east and west.
The prime Meridian is 0 degrees longitude.
The island is located somewhere in the Indian ocean at these coordinates/longitude and latitude WGS84 12° 0′ 0″ S, 78° 0′ 0″ E -12, 78
South America
The Prime Meridian.
To navigate on a globe, use the latitude and longitude lines to determine specific locations. Longitude lines run from the North Pole to the South Pole, while latitude lines run parallel to the equator. By using these coordinates, you can pinpoint exact locations on the globe.
Assuming that "all the way west of the Prime Meridian" would be on the opposite side of the globe from the prime meridian, or at 180o, "halfway west of the Prime Meridian" would be the 90oW meridian.