It is 90
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180 degree longitude or 0 degree longitude means the same thing. Now when someone crosses this line one has to make some changes in the time e.g when one crosses this line and moves towards east it will gain one day, if one crosses and moves towards the west then one losses one day
its the equator
The eastern and western hemispheres are separated by a single continuous line which passes through the geographical north and south poles. On the one side of the earth, it is the 0, or Greenwich, Meridian and, on the other (Pacific) side, it is the 180 meridian (which should not be confused with the International Date Line - though this approximates to the 180 meridian, it zig-zags across it repeatedly, at the behest of political convenience).
Most world maps will show you this. The northern and southern hemispheres are divided by the Equator, which will be visible on most world maps. Eastern and Western Hemispheres are not as strictly defined, but a dividing line defined by 0° (Greenwich) and 180° is common, as is one using 20°W and 160°E, which leaves the Americas on one hemisphere, and Africa and Europe entirely on the other.
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.