以桥头控制桩为基准设立辅助测站，用《曲线测设综合公式》求取在辅助测站上桥梁各墩台的交会角度。
By virtue of an aid station based on the abutment central pile, "comprehensive formulas for the layout of curves "is used to calculate the crossing angles of every pier or abutment.
分析了单向光电三角高程测量的误差来源，在此基础上推导了最佳测站位置离测点的平距公式。
Based on the error resource analysis in one-way photoelectric triangulated heigh survey, the horizontal distance equation is drawn for optimal station away from survey point.
测座北京古观象台或许是世界上历史最悠久的气象观测站，比格林威治天文台还要早二百年。
It has perhaps the longest recorded history of uninterrupted service of astronomy. It is 200 years older than Greenwich Observatory.
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