A written year
1000 — already written.
That year was
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Days ago (about)
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Years ago
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Generations back
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Lifetimes back
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Full moons since (about)
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Zodiac cycles since
The world then
Leif Erikson reaches North America around this year — about five centuries before Columbus. Song-dynasty China is the richest power on Earth, and the Islamic world is in a golden age of science.