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一二七九年前后,元代在周公测景台北约二十多米处,修建了一座雄伟的观星台(如图)。这里有当时的杰出天文学家郭守敬和王恂设计营造的四十尺高表和一百二十八尺长圭。圭和表互相垂直,组成“圭表”。古时“圭表”在天文历法上可有如下之用途:(一)由表影长短的周期性变化而确定
Before and after 1279, the Yuan Dynasty built a majestic observatory (pictured) at about 20 meters above sea level in Taipei. There are forty-foot-high tables and one hundred and twenty-eight-foot long kyu designed by the distinguished astronomers Guo Shou-jing and Wang Nai at that time. Kyu and table perpendicular to each other to form a “table.” Ancient “Guixi” in astronomical calendar can have the following purposes: (a) by the periodic changes in the length of the table to determine