Question

which star always remains in the same position in the sky

Answer 1

Pole star is the answer of your question

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. The name is frequently applied to Polaris in the constellation Ursa Minor, acknowledging its property (extant since the 10th century) of being the naked-eye star closest to the Earth's north celestial pole. The name Polaris, introduced in the 18th century, is shortened from New Latin stella polaris, meaning "pole star". Polaris is also known as Lodestar, Guiding Star, or North Star from its property of remaining in a fixed position throughout the course of the night and its use in celestial navigation. It is a dependable, though inexact, indicator of the direction toward the geographic north pole; it is virtually fixed, and its angle of elevation can also be used to determine latitude.