北京古观象台兀然矗立在建国门立交桥的西南侧,是全国重点文物保护单位,是世界上古老的天文台之一。北京古观象台始建于正统七年(1442年),当时称作观星台,高约14米,台上安放着浑仪、简仪浑象(天体仪)等大型铜制天文观测仪器。在台下,从公元1442年至1446年,按中国传统的四合院布局,先后建成了紫微 Beijing Ancient Observatory Wuran stands on the southwestern side of the Jianguomen Overpass and is a national key cultural relics protection unit and one of the oldest observatories in the world. Beijing Ancient Observatory was founded in the orthodox seven years (1442), was then known as the Observatory, about 14 meters high, on the stage with a large instrument, celestial bodies (celestial bodies) and other large copper astronomical instruments. Under the stage, from 1442 to 1446 AD, according to the traditional Chinese courtyard layout, has built a purple micro