What is the prime meridian?

Question

BlackTom AI · Accepted Answer

The question asks: What is the prime meridian? 
Option 1: Line of 0 degrees longitude. This directly matches the definition of the prime meridian, which is the reference line for longitude at 0° that runs from the North to the South Pole through Greenwich. 
Option 2: Line of 0 degrees latitude. This describes the equator, not the prime meridian. Latitude lines measure angular distance north or south of the equator, while longitude lines measure east or west from the prime meridian. 
Option 3: The origin of a coordinate system. While the prime meridian is a foundational reference in the geographic coordinate system, saying it is “the origin” can be misleading because longitude has 0° at the prime meridian, but latitude’s origin is the equator. In many coordinate frameworks, the term “origin” isn’t commonly used to describe the prime meridian alone, so this phrasing is imprecise and potentially confusing. 
Option 4: The equator. The equator is a circle around the middle of the Earth at 0° latitude, not related to the prime meridian, which is a longitudinal reference line. 
In summary, option 1 correctly identifies the prime meridian by its defining feature (0 degrees longitude), while the other options mix up latitude, the equator, or generic coordinate-system terminology, leading to inaccuracies about what the prime meridian represents.

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