1. an instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration. 
   测量天体角度的仪器；类似于六分仪但是带有度的刻度。
2. either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration. 
   相交在一台光学仪器焦距平面的两条相互垂直的直线中的任何一条，用来瞄准或者校准。
3. calibration of celestial radio radiation 
   天体射电的定标
4. The Standards and Calibration Laboratory holds the official reference standards of measurement for Hong Kong and provides calibration services in various measurement areas. 
   标准及校正实验所负责保存香港的各项正式计量基准，并提供多类测量校正服务。
5. The Standards and Calibration Laboratory (SCL) holds the official reference standards of physical measurement for Hong Kong and provides calibration services in various areas traceable to the International System of Units of Measurements (SI). 
   标准及校正实验所除了保存香港官方的物理测量参考标准外，亦就不同范畴提供可溯源至国际单位制的校正服务。

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