Which astronomy book of the Warring States is the oldest in the world?
世界上最早的天文学著作是战国时期的？
Writing in the warring states period wonderful indeology in: "the world nine fill, ranking the record count one."
成书于战国时期的《吕氏春秋》中就有：“天下九塞，居庸其一”的记载。
Writing in the warring states period wonderful indeology in: "the world nine fill, ranking the record count one."
成书于战国时期的《吕氏春秋》中就有：“天下九塞，居庸其一”的记载。
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