Chinese astronomers in the year 185 C.E. recorded in the Book of the Later Han the appearance of a "guest star" in the night sky, which remained there for about 8 months.
公元185年，中国古代天文学家在《后汉书》中记录了出现在夜空中的一颗被称为“客星”的星体，这颗星体存活了大概8个月。
Ming-Tang, as an important Li-institution building, had a Ya-shape plan before Han dynasty, which originated from the universe mode of round sky with Ya-shape earth in ancient times.
明堂作为重要的礼制建筑，汉代以前平面为亚形，源自于上古时代天圆地亚形的宇宙观。
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