本初子午線
本初子午線（英語：Prime meridian），也叫本初經線，是畀定義做0度個經線（也叫子午線）。本初子午線個東西兩半邊叫東經搭西經，勒180度碰勒一淘。
1884年，美國華盛頓特區舉行個國際本初子午線大會上確定格林尼治子午線是經度嘅起點。必過法國勒1911年前頭用個還是巴黎子午線做經度起點。
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