圖太圖說

圖太圖說

旋一度,所以自戊冬至行至壬春分,漸上,至已夏至又行至癸秋分,漸下,復戊冬至。一上一下,因而出入赤道南北,爲冬夏,爲晝夜長短。必行至雨道相交一點,爲春分、秋分,則晝夜平也。四七齡。吳長規

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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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