Question

How pole star was usefull in ancient times

Answer 1

It also is used to assist humans in finding north - since it's stays in the same place all through the night and year. The Pole Star, or Polaris, is directly above Earth's North Pole. From our perspective on Earth, every star in the sky pivots around the Pole Star, causing them to rise and set.

Answer 2

Pole star or polar star refers to a star, preferably bright, closely aligned to the axis of rotation of an astronomical object. This is most commonly used for stars close to the north and south celestial poles of the Earth

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