圜天圖說正續編
月行次輪說

月行次輪說

月行次輪說

七政所行,參差不一,日有盈縮,月有遲疾,五星有留退,隨天運行,因運而生輪,因輪而生高下遠近。仰而視之,盈縮遲疾留退,顯而可徵,葢有故焉。太陽從天,本輪則一,月與五星從天又從日,故有隨日之輪,又有逐日之輪。雨者相加,然後高下視徑,遲疾視差,一一可籌策運算焉。夫恒星天以地爲心,七政之天宜亦以地為心,然因

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