若一個(gè)為東經(jīng)度,一個(gè)為西經(jīng)度,兩地經(jīng)度和小于180度,則東經(jīng)度在西經(jīng)度的東面；反之,若一個(gè)為東經(jīng)度,一個(gè)為西經(jīng)度,兩地經(jīng)度和大于180度,則東經(jīng)度在西經(jīng)度的西面.如：東經(jīng)60度和西經(jīng)110度,兩地經(jīng)度和為170度,小于180度,...