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prime meridian 本初子午線。

prime minister

The prime meridian , which runs through greenwich in south - east london , became the basis for the world ' s time keeping in 1884 after the first astronomer royal , john flamstead , calculated that the earth rotated on its axis once every 24 hours 1884年,首位皇家天文學家約翰法蘭姆斯坦算出地球每隔24小時繞軸自轉1次,使得通過倫敦東南格林威治的本初子午線成為全球計時基準。

Lines of longitude are measured in degrees east or west of the prime meridian , which runs through greenwich in london , while lines of latitude are given in degrees north of south of the equator 穿過倫敦格林尼治的經線叫做本初子午線( 0度經線) ,經度以東西距離這條經線多少度來計算,而緯度以離赤道南北多少度來計算。