- The chart depicts years with a chronological line at the top, radiating from a center point of the birth of Christ. "BC" has been added to the entries where required as illustrated by the structure of the chart, but not actually written. Spatial coverage has been determined by the labels on the chart running along the right side, separated across the chart with horizontal lines, and narrowed within each horizontal line by smaller areas. Ending dates of 1770 derived from the year of publication, and also the point at which the chart ends.
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