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。
The computation results basically correspond with the longitude where the earthquake practically occurred, this means that earthquake has some relation with the astronomical factors.
计算结果与实际发生的地震经度基本符合，这说明地震与天文因素有一定的关系。
The computation results basically correspond with the longitude where the earthquake practically occurred, this means that earthquake has some relation with the astronomical factors.
计算结果与实际发生的地震经度基本符合，这说明地震与天文因素有一定的关系。
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