为了解决在海上计算经线的问题，1675年英格兰国王查理二世下令建造了皇家格林尼治天文台，同时他还悬赏了一大笔奖金，给予第一个发明出在海上也能准确计时的钟表的人。
He offered an enormous cash prize to anyone who could build a clock that would remain accurate at sea.
他们选取了经英国格林威治的经线作为标准线(这各标准已经被海员使用了几个世纪了)。
They selected the longitudinal line that runs through Greenwich, England, as the standard from which they would measure (it had already been used by sailors for centuries).
地理时间的使用始于大英帝国时期，当时用纬线和经线划分世界，零度经线通过伦敦的格林尼治天文台。
The geographic use of time began during the British Empire with the world divided by latitude and longitude, with zero degrees longitude running through the observatory at Greenwich, in London.
国际本初子午线大会于1884年把横过英国格林尼治天文台的一条经线定为参考线，在该线上经度为零。
The Greenwich meridian was adopted in 1884 by the International meridian Conference as the line with zero degrees of longitude.
现在我们一致认为0度经线的位置以格林威治天文台为准。
Now we're agree that the Greenwich Observatory is zero degrees longitude.
现在我们一致认为0度经线的位置以格林威治天文台为准。
Now we're agree that the Greenwich Observatory is zero degrees longitude.
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