当真北和磁北相吻合的时候，确实存在一些被称为无偏线的地理线。

Geographical lines do exist where true north and magnetic north are aligned, and these are called agonic lines.

youdao

当真北和磁北相吻合的时候，确实存在一些被称为无偏线的地理线。

Geographical lines do exist where true north and magnetic north are aligned, and these are called agonic lines.

youdao