Span and Reach are coordinate directions used in a multitude of scientific branches and occupations. Unlike the three-dimensional spherical system, AAE, used by astronomers, span and reach are two-dimensional, tailored to the Plane’s flat landscape centered around the central pole and using the cardinal directions.1
Span is a measure of a points angular direction relative to the central pole, expressed in degrees. A 0° span is traditionally pointing directly north, increasing starward2. Span around the Plane is fully continuous, making a 360° cycle. Reach is a measure of a points distance outward from the central pole, expressed in units, which may vary in scale dependent on the context. Reach begins at 0 units at the central pole and increases with distance outward. A point in the coordinate system is denoted by combining the Span and Reach in the format (Span°, Reach).
Most often on world maps span is divided into eight equal slices of 45° intervals and reach is divided into ten equal rings approximately 1/10th the radius of the Plane.
See Also
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