-- The "Prime Meridian" marks zero longitude.
-- The "180th meridian" marks 180° longitude.
The International Dateline is either on or relatively near the 180th meridian
at any given latitude on it.
The highest longitude lines are the prime meridian at 0 degrees longitude and the 180 degrees longitude line. These lines mark the starting point for longitude measurements to the east and west, respectively.
They are called the lines of longitude. Lines of longitude range from 0 degrees on the prime meridian to 180 degrees.
There are 180 lines of latitude, which include the equator and extend from 0° at the equator to 90° North and 90° South at the poles. For longitude, there are 360 lines, with the Prime Meridian at 0° and extending from 0° to 180° East and 180° West. Together, these lines create a grid that helps in pinpointing locations on Earth.
No. 90 degrees longitude is not a major line of longitude. Only 0 and 180 degrees longitude, which are the Greenwich Meridian and the International Date Line respectively, are major lines of longitude.
Zero to 180
The equator is located at 0 latitude. Fullstop. Being a parallel it spans the whole range in longitude, from 0 to 180 and back again.
As you travel west on a map, the longitude decreases. Longitude lines are measured in degrees, with the Prime Meridian at 0° longitude. Moving westward, each degree of longitude represents a movement from 0° toward 180°, resulting in negative values in the Western Hemisphere. For example, moving from 0° to 30° west means a change from 0° to -30° longitude.
Longitude is labeled from zero (at the Prime Meridian) to 180 degreesin each direction, east and west, from it.
Zero to 180 west and zero to 180 east.
Zero to 180 east and zero to 180 west
Zero to 180 east and zero to 180 west
There is no such longitude. The maximum degrees for lines of longitude is 180 east and west only.