Every point on that particular meridian is equally distant
from any point you choose on the Prime Meridian.
The difference between those two positions is 180 degrees in longitude.
360 degrees. Longitude runs from 180 degrees East to -180 degrees West.
180 degrees
+180 degrees.
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.
There is no 200 degrees of longitude. There is 180 degrees west of the Greenwich Meridian and 180 degrees east of the Greenwich Meridian. All degrees of longitude on earth converge at the South and North Poles.
180
The Antimeridian.
0 degrees longitude
The divisions of longitude are measured in degrees. The Earth is divided into 360 degrees of longitude, with the Prime Meridian (0 degrees longitude) serving as the starting point. Longitudes range from 0 degrees to 180 degrees east or west of the Prime Meridian, with 180 degrees being the International Date Line.
It is usually 180 degrees longitude, hope this helped.
-- The northern and southern hemispheres each have 90 degrees of latitude and 360 degrees of longitude. -- The eastern and western hemispheres each have 180 degrees of latitude and 180 degrees of longitude.