Ancient mariners, whether they be Vikings or South Sea Islanders, would navigate with astronomicalbearings by reading the celestial bodies as well as landmarks.
古代的航海家，不管是维京人还是南太平洋岛民，都会携带天文仪出海，以观天象和地标。
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They are able to do so because these records use both compass bearings and astronomical observations to locate a vessel.