九坎是中国古代星官之一,属于二十八宿中的牛宿,位置在现代星座的望远镜座[1]。《丹元子步天歌》中有描述“牛下九黑是天田,田下三三九坎连”[2],在此描述中,九坎的对应位置同时存在另一星官離瑜。九坎确定恒星对应。
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