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1  | 求得己丑一一四又 一0五之三0 約之得一一四又七分之二內減己子月距地三 0餘子丑八四又七分之二為地影尖距月之度 |
| 2 | 已知月地距測 日食東西視差以推日地距其法若何 |
| 3 | 楊兆鎣 |
URN: ctp:ws765111
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