longitude of central meridian 中央经线 ; 中央子午线经度
Greenwich thus became established as the location of the prime meridian of longitude, and the base line for calculating time zones around the world.
由此格林威治不仅作为起初子午线的所在地，也成为全球计算时区的基准线。
All places on the same meridian have the same longitude.
子午线上的地方都有相同的经度。
The Greenwich meridian was adopted in 1884 by the International meridian Conference as the line with zero degrees of longitude.
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。
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