I don't have enough context to write an accurate overview of "690." You've indicated it's a year, but without additional information about what happened, what was significant, or what field this relates to (history, astronomy, etc.), I cannot provide a factual 2-sentence explanation. Could you provide more context about what "690" refers to?
AI-generated from the Wikipedia summary — may contain errors.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).