1、
By agreement, the longitude passing through Greenwich of Observatory is called the prime meridian.
按照约定, 经过伦敦格林尼治天文台的经线被称为本初子午线(零度经线).
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By agreement, the longitude passing through Greenwich of Observatory is called the prime meridian.
按照约定, 经过伦敦格林尼治天文台的经线被称为本初子午线(零度经线).
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