The structure, reading set and observing methods of the instruments for time measuring and keeping, such as gnomon, sundial, armillary sphere and clepsydra in Song dynasty, have been analysed and their observation errors have been obtained.
对我国宋代测时设备圭表、日晷、浑仪和守时设备漏壶,从它们的结构,读数装置、观测方法等分析其观测误差。
Later, in order to facilitate the observation of more celestial bodies , such as the sun , the planets , and the moon , more rings were added inside the armillary sphere , making it a multi-purpose astronomic instrument.
后来,古人为了便于观测太阳、行星和月球等天体,在浑仪内又添置了几个圆环,使浑仪成为多种用途的天文观测仪器。
The armillary sphere's structure was very simple at the very beginning , with three rings and a metal axis.
最初,浑仪的结构很简单,只有三个圆环和一根金属轴。
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