![]() ![]() The calendar years scale in the middle measures time using the Gregorian calendar, the familiar international standard for secular use that was developed in the Christian world. occurred, simply add 2,000 years (for instance 2,000 B.C. The following rule of thumb may be helpful: to figure out how about many years ago any calendric age in years B.C. ![]() A recent informal survey among the undergraduate students of an introductory archeology course at one of Texas' major universities showed that many students seem to have difficulty in translating calendar years B.C. The years ago scale on the right is directly correlated to the calendar years scale and is given here for convenience. Three timelines or scales are shown side-by-side, radiocarbon years, calendar years in BC/AD, and years ago.
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