“prime grid meridian”的概念、定义、翻译、参考文献-科学参考

单词	prime grid meridian
释义	prime grid meridian [`prīm `grid mǝ´rid·ē·ǝn] ^NAVIGATION The reference meridian of a grid; in polar regions it is usually the 180-0° geographic meridian, used as the origin for measuring grid longitude.
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