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       We all know what B. C. means in the context of (for example) 44 B. C. but how many of you know what the letters A. D. mean? B. C. is before Christ and A. D. is anno domini which is latin for year of our lord. This is one of the many useless but fascinating facts about calendars which can be found in the following links.

Calendar FAQ
Interesting Calendar Facts
timeanddate.com
Pope Gregory XIII who initiated the Gregorian calendar which is in general use today