Why pole star is important for astronomers in ancient times?

Explanation

### Step-by-Step Solution:

1. **Understanding the Importance of the Pole Star**: The Pole Star, also known as Polaris, is located nearly directly above the North Pole. This unique position makes it a fixed point in the sky, which does not change its location as other stars do.

2. **Navigation Tool**: In ancient times, sailors and travelers relied on the stars for navigation. The Pole Star served as a crucial reference point for determining direction. Since it remains in a constant position, it was easier for navigators to find their way.

3. **Finding Directions**: By locating the Pole Star, travelers could easily identify the North direction. From there, they could determine other directions: South is directly opposite the North, while East and West can be found by turning 90 degrees from the North direction.

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