first meridian

• 本初子午圈线,本初子午线

first meridian的用法和样例：

例句

1. Royal Observatory, home of Greenwich Mean Time and thePrime Meridian line, is one of the most important historicscientific sites in the world.
   格林威治的皇家天文台是格林威治标准时间和世界本初子午线。