淮南子天文訓術算

兩繩兩維四鉤:

二绳”把天穹划分为四区，即分别由丑寅、辰巳、未辛、戌亥组成的四鉤。

“东北为报德之维也，西南为背阳之维，东南为常羊之维，西北为蹄通之维。”

“两维之间，九十一度十六分度之五而升，日行一度，十五日为一节，以生二十四时之变。”

- 來自天圓地方學說：

古人对“地”的设想是由两条射线穿越观察点作十字交叉，向四个方向作平面延伸（没有曲率）。这两条射线，古人叫“二绳”；四个方向，古人叫“四方”。“四方”代表的方向叫“四正”，“四方”之间的平分线叫“四维”，“四维”代表的方向叫“四隅”。

參考下圖中術算用的六壬式盤。

太乙九宮盤有刻上冬至夏至，春分秋分，及立春立夏立秋立冬：

Reference:

六壬式盤

式盤研究

六壬式盤考徐州博物館

雙古堆式盤

六壬式盤布局補議張雨絲

天圓地方蓋天論學說

二十四方位 cuhk

日本古天文學會二十八宿盤考

Zhihu

Ustcif

Ancient astronomy chart Github

Btw, 二十八宿式盤會否就是落下閎的渾儀？

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