圜天圖說正續編
南北周天純度說

南北周天純度說

南北周天純度說

可。周天經度,須從南北兩極正中一線員通。北乃天正位,而應子午規,所分東西以劉經名九十度至分四象限也。全周則三百六十爲經,以在南北正極起處分之,中間闊府頭稱,無論關秋苦。以三百六十度爲限,以正十二宫,每宫三十康,以半分宫限之界,其度與黄道距交,正得一度之周,去赤道漸遠,則漸漸狹。心,百人七弋,歸轉

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