created sense approved 本初子午线/本初子午線 · běnchūzǐwǔxiàn · prime meridian
本初子午线 / 本初子午線
běnchūzǐwǔxiàn
prime meridian
the meridian of zero degrees longitude, used as the origin for measuring longitude and as the basis of standard time
本初子午线被定义为经过英国格林尼治天文台的经线。