This true north does not mean a simple coincidence, because it is thought that in the Yamato Dynasty there was probably a custom of burying the deceased with his or her head pointing to true north.
この真北は単なる偶然ではなく、ヤマト王権の中に被葬者の頭を真北に向けて埋葬する風習があったらしいと考えられている。