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  1. For this reason, the end date of the 2nd millennium is usually calculated based on the Gregorian calendar, while the beginning date is based on the Julian calendar (or occasionally the proleptic Gregorian calendar). In the late 1990s, there was a dispute as to whether the millennium should be taken to end on December 31, 1999, or December 31, 2000.

  2. The first millennium of the anno Domini or Common Era was a millennium spanning the years 1 to 1000 (1st to 10th centuries; in astronomy: JD 1 721 425.5 – 2 086 667.5). The world population rose more slowly than during the preceding millennium , from about 200 million in the year AD 1 to about 300 million in the year 1000.