So far, astronomical geodetic surveying work, also according to the principle of.
至今，天文大地的测量工作，也还是根据这一原理进行的。
The error derived from the observer and his instruments in surveying astronomical longitude is called the person and instrumental equation, which must be corrected in the first and second degrees.
摘要： 在天文经度测量中，由观测员及其所用仪器引起的误差称为人仪差，在一、二等天文测量中必须加入此项改正。
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