The correct option is (a).
Explanation
The Pole Star, also known as Polaris, is a prominent star that holds a significant place in celestial navigation and astronomy due to its unique alignment with the Earth's rotational axis.
- Statement 1 is Correct: The Pole Star is situated almost directly above the Earth's North Pole. Consequently, it always indicates the North direction. By locating this star, observers can determine the cardinal directions during the night.
- Statement 2 is Incorrect: Unlike other stars that appear to move across the sky from east to west due to the Earth's rotation, the Pole Star appears to remain stationary at the same position in the sky. This is because it lies very close to the line of the Earth's axis of rotation extended into space.
- Statement 3 is Incorrect: The Pole Star was well-known to ancient people. Before the invention of the compass and modern navigational tools, travelers and mariners relied heavily on the Pole Star to determine directions during the night.
Key Takeaway: The Pole Star (Polaris) appears stationary and indicates the North direction because it is aligned with the Earth's axis of rotation, a fact utilized for navigation since ancient times.