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                        皇穹宇



                        皇穹宇

                               皇穹宇在成貞門之南,圜丘之北,是存貯祭天正位、配位及從祀位神版的場所,又稱天庫。皇穹宇有正殿、配殿、圍垣及券門諸建筑,皇穹宇即因正殿榜書而得名。
                               皇穹宇正殿為供奉皇天上帝及配祀諸神位之處,藍色琉璃圓形單檐攢尖頂,鎏金寶頂,通高19.2米,直徑15.6米。檐柱、金柱俱8根,南向開戶,菱花格隔扇門窗,藍琉璃檻墻,東西北三面封以磚,俱干擺到頂。殿內穹窿圓頂,正中貼金盤龍藻井,貼金雙龍天花,金柱貼金纏枝蓮,內外施金龍和璽彩畫。殿內正中有前圓后翹角石須彌座,座高1.51米,徑2.53米。
                               皇穹宇圍垣具有傳聲功效,俗稱回音壁。歷史上皇穹宇圍垣的傳聲功效頗使人迷惑,長期以來人們無法科學地解釋這一現象。1953年,湯定元教授對皇穹宇建筑的聲學效果進行了測試,認為皇穹宇圍垣周密,表面光潔,使聲波不被墻體吸納,進而發生了反射,于是產生了回音,形成了獨特的聲學現象。這是歷史上第一次對天壇諸建筑的回聲現象進行的科學解釋。

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