Western meridian（西子午线）是什么意思？音标发音+图解场景

西子午线 /ˈwɛst ˈɪndiz/ n

English: Western meridian · 西子午线

释义：Imaginary line connecting the poles and perpendicular to the Equator; located west of the Greenwich meridian.

这个词出现在以下图解场景（1）