non-repeating base-20 and base-18 calendar used by several pre-Columbian Mesoamerican cultures, including the Maya
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長紀曆是瑪雅曆的曆法中周期最長的曆法。出土文物中，最長的有延續至西元9000年左右。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).