History of Ming 明史
卷三十九 志第十五 曆九 Volume 39 Treatises 15: Calendar 9
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志第十五 歷九▲回回曆法三
土星黃道南北緯度立成上橫行，以小輪心定度爲引數，起五十度，異累加三度。累加三度。首直行以自行定度爲引數，累加十度。求法：簡兩引數近度，縱橫相遇度分，次各用比例法，得細率。
表格略
Chinese text: This work was published before January 1, 1923, and is in the
public domain worldwide because the author died at least 100 years ago.
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