Question

How pole star help travellers and sailors at night?

Answer 1

the pole star indicates north , and travellers as well as sailors can easily find directions with it's help.

Answer 2

☺
The pole star or the North star or the Polaris is a star that is situated at the north side of earth.

Unlike other stars, Polaris does not changes its place because of its location along with the Earth's Axis.

So; travelers find it easy to indicate the North direction just by looking at the Polaris.
☺