The Armillary Sphere was created by Luoxia Hong during during the Western Han Dynasty (206 BC-220 AD). 

The first celestial globe was built during the First Century BC, thus the design continuously improved until it reached its final form in the Song Dynasty around 1,000 years later. Armillaries utilize converging protractor rings, dividing the globe, and allow an astronomer to track celestial movement and corresponding calendar information. Armillary Spheres could measure the coordinates of the "fixed" stars and measure the courses of the sun, stars, moon and planets. However, due to the sphere's interlocking rings, it was difficult to map the entire sky. Life sized armillaries stand about 2 meters high. 

渾天儀是西漢時期（公元前206年-公元220年）由羅夏弘所創造的。

世界上的第一個天球儀建於公元前一世紀，設計經歷了不斷的改進，直到大約 1000 年後在宋代才達到其最終形式。渾天儀利用了會聚的量角器環來劃分地球，並允許天文學家跟踪天體運動和相應的日曆資訊。渾天儀可以測量「固定」恆星的坐標，同時亦能夠測量太陽、恆星、月亮和行星的軌道。然而，由於渾天儀環環相扣，因此我們很難繪製整個天空的地圖。真人大小的渾天儀高約 2 米。