圜天圖說正續編
地平見月遲早說

地平見月遲早說

地平見月遲早說

朔日以後,每日月輪離日十度,則第二日日輪入地下時,月在日東,又離七度,在地平亦得十三度,理應得見月有一線之光,乃有遲至三日四纔見月光者。此不同之說,皆由地平與黃道有斜,正交故也。人居地面初見月光者,月輪必在地。

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Text and scans: Shidian Guji (Peking University – ByteDance open ancient texts). Edition details are given per book. Shidian Guji

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