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.
将其与子午线或其他的自然基准进行挷定并不是件容易的事情。
Tying it to the meridian, or any other natural benchmark, proved intractable.
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