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。
Greenwich thus became established as the location of the prime meridian of longitude, and the base line for calculating time zones around the world.
GMT是一种通用时区，是根据格林威治子午线，用设定时间所在位置的经度与其求差计算出来的。
GMT is a universal time zone, based on the Greenwich meridian corrected by the longitude of the location in which the time is set.
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