The line of 0° longitude is called the prime meridian (it is also known as the Greenwich Meridian).
The Prime Meridian
The Equator is 0 degrees latitude, and the Prime (or Grenwich) Meridian is 0 degrees longitude.
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.
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They are called the lines of longitude. Lines of longitude range from 0 degrees on the prime meridian to 180 degrees.
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.
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).
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0 degrees longitude
The lines are never measured. They're only markers. Latitude and longitude are angles, that describe the locations of points on the surface of a sphere. They're expressed in units of angle measure, typically in decimal degrees, or degrees, minutes, and seconds.
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The answer is equator
The prime meridian is located at 0 degrees longitude.