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Scope: 清史稿 |
Condition : Contains text “康熙五十五年三月丙申 (1716/3/28)” |
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《志二十二》
6 ![]() | 一,求地半径差以验地心实高、地面视高之不同。康熙五十四年五月甲子午正,在申昜春园测得太阳高七十三度一十六分零二十三微,同时于广东广州府测得太阳高九十度零六分二十一秒四十八微。申昜春园赤道距天顶三十九度五十九分三十秒,广州府赤道距天顶二十三度十分,偏西三度三十三分。时夏至后八日,日躔最高,用平三角形推得地半径与太阳距地心比例,如一与一千一百六十二。又康熙五十五年三月丙申午正,在申昜春园测得太阳高五十三度零三分三十八秒一十微,同时于广东广州府测得太阳高六十九度五十四分零八秒三十六微。时春分后八日,日躔中距,推得地半径与太阳距地心比例,如一与一千一百四十二。乃以太阳最高与本天半径比例数一0一七九二0八与地半径比例数一一六二之比,为太阳最卑与本天半径比例数九八二0七九二与地半径比例之比,得一千一百二十一。既得三限距地心之远,用平三角形逐度皆推得地半径差。 |
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