Prime meridian
01
本初子午线, 格林尼治子午线
an imaginary line that goes from the North Pole to the South Pole, which helps to measure how far east or west a place is on Earth
例子
The prime meridian is crucial for global navigation and timekeeping.
本初子午线对全球导航和时间记录至关重要。
Greenwich Mean Time is based on the prime meridian.
格林尼治标准时间基于本初子午线。
