英语词典
In all cases the gnomon lies in the plane of the meridian.
表始终都处于子午面内.
词典精选例句
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。
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