描述: 经线也称为子午线。本初子午线被定义为 0 度经线。它穿过英国伦敦的格林尼治，也被称为格林尼治子午线。180度经线位于 地球的另半边，经度180 度，是国际日期变更线的基础。

相关词条

• 经度

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