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水浪窩觀星台


  水浪窩觀星台建於1980年代初。這是仿照明代的一座觀星台，是國內現存最古老的天文臺——河南登封告成觀星台建造，此台可觀測日影。又名測影台



這建築物上有一天文儀器, 稱為圭表, 高6米 ( 告成的 2/3 高度)
告成圭表 ：四丈高表高9.81米（按元朝景表尺每尺长24.525厘米算）

郭守敬：晝觀日影，夜觀星象（北極星過中天時刻）

告成觀星台坐標: 34.4006739,113.1459475

 唐朝的天文學家一行在國內各地建立了20餘個標準化的晷針來測量不同地點的均時差。後續的劉焯從AD604年起，在在現今的本初子午線以東114° 上，沿著子午線從中亞到越南建立的10個測站，在理想的球面上測量地球這個球體。其中一個測站就建在現今的告成鎮附近，而觀測的成果被用來創建大衍曆。

在觀星台的南方可以找到由一行建造的石龜圖，根據《周禮》的記載，這個地方是地球的中心。
 



 但因為在地面的圭尺是往南方申延, , 一年中祗有6至8月,太陽在天球北半球時,投影才會落在圭尺上 




兩圭表“測日高”， 可能當時不能接“地圓説”，此乃用來測地的圓周。



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