公式法求大圆始航向的探讨

Analytical method for determining the initial course of great circle track

针对地文航海教材中在利用公式法求大圆航线始航向时所存在的问题进行了系统的分析和研究．重点叙述了正弦公式中利用经差的比较来确定航向名称的问题．特别强调了在利用公式法求大圆航线始航向应该注意的问题，进而纠正了一些教材中存在的错误概念，弥补了其中的不足．

he analytical method for determining great circle initial course has been restudied, and with the development of its application it is found that the related formula and concepts contained in the prevailing textbook should be corrected and completed.