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论述了北京地磁台天文方位标志的选点定位、造标埋设、方位角的测量方法。对８个观测墩位一个测点进行了方位角测量。通过计算方位角绝对精度ΔＡ＝２．４９″，平均观测均方差Ｍ＝±１．１４″，相当于三等天文观测精度，能满足地磁偏角６″的精度要求。
The method of measuring the location of the astronomical bearing of the geomagnetic observatory in Beijing and the method of measuring the buried depth and the azimuth of the geomagnetic observatory are discussed. Azimuth measurements were taken at a measuring point of 8 observation piers. By calculating the absolute azimuth accuracy ΔA = 2.49 “, the average observed mean square error M = ± 1.14”, equivalent to third-class astronomical observation accuracy, to meet the accuracy of magnetic declination 6 ".