圜丘坛是我国明朝嘉靖年间建立的一个三层露天圆台，别名祭天台，由圜丘、皇穹宇及配殿、神厨、三库及宰牲亭等组成。其位于天坛南部，为皇帝冬至日祭天大典的场所。
祈年殿与圜丘坛均为圆形，立于方形坛内，象征着天圆地方。
Both the Hall of Prayer for Good Harvests and the Circular Mound Altar are round, each standing on a square yard, again representing Heaven and Earth.
在圜丘坛是较重要的建筑之一，是一个三层的白色石头平台由两个围墙。
The Circular Mound Altar is one of the more important buildings and is a three-tier white stone terrace enclosed by two walls.
圜丘坛的每个阶层有九节台阶，九在中国古代曾经被认为是最大的数字。
Each level consists of nine stairs, as the number "nine" - the largest single digit number - represents the ultimate sovereign power of the emperor.
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