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来自维基百科,自由的百科全书
計都(Ketu)是古代印度天文學名詞,原本指月球之遠地點,為月行最遲之處。後來,這定義在古中國天文學中為月孛所繼承,計都的定義就變作月球軌道與黃道的升交點(據沈括)或降交點(據湯若望),這是月球穿越黃道的交會點,見黃白交點/月球交點。
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