____ is an arbitrary chosen line of reference.

____ is an arbitrary chosen line of reference.

• A. Prime meridian
• B. Arbitrary meridian
• C. Central meridian
• D. Local meridian

Answer: (B)

An arbitrary chosen line of reference is a meridian designated as zero longitude for a local coordinate system. It’s picked by convention for the project, not because it has universal geographic significance, so all measurements are defined relative to that line. This flexibility is what the term arbitrary meridian captures: you select it to fit the task at hand. In contrast, the prime meridian is a fixed global reference at 0° longitude (Greenwich). A local meridian is simply the north–south line through a specific location used for measurements there, not a universal frame. The central meridian is the longitude chosen as the center for a particular map projection, a deliberate, zone-specific reference.

An arbitrary chosen line of reference is a meridian designated as zero longitude for a local coordinate system. It’s picked by convention for the project, not because it has universal geographic significance, so all measurements are defined relative to that line. This flexibility is what the term arbitrary meridian captures: you select it to fit the task at hand. In contrast, the prime meridian is a fixed global reference at 0° longitude (Greenwich). A local meridian is simply the north–south line through a specific location used for measurements there, not a universal frame. The central meridian is the longitude chosen as the center for a particular map projection, a deliberate, zone-specific reference.