子午线数字中继器通过一个红色LED条线图测量磁场或真是指向，误差仅为1/10度。
The Meridian Digital Repeater indicates magnetic or true heading to 1/10th of a degree and rate of turn via a red LED bar graph.
由悬挂式二自由度陀螺罗盘仪和经纬仪组合而成的陀螺经纬仪，是工程测量领域中用以确定子午线方位的主要仪器。
The gyro-theodolite , which is composed of a suspended two-degree-of-freedom gyrocompass and a theodolite, is the main instrument in the engineering measurement for meridian determination.
近代大地测量中，是利用恒星来测定地球某两地间子午线弧长的。
Modern geodesy, is used the stars to determine the earth a between meridian arc length.
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