本初子午線
本初子午線（英文：Prime meridian），又叫本初經線，即係被定義做0度嘅經線（亦稱子午線）。本初子午線嘅東西兩邊分別叫東經同西經，喺180度相遇。
1884年，美國華盛頓特區舉行嘅國際本初子午線大會上確立格林尼治子午線係經度嘅起點。但法國喺1911年之前重係用緊巴黎子午線做經度起點。
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