Civil Engineering - Advanced Surveying - Discussion

How? Explain.

Explain the answer clearly.

At western elongation, the pole star (Polaris) appears to move westward relative to the horizon.

This is because western elongation refers to the position of a celestial body (like a planet or star) when it is at its greatest angular distance west of the Sun, as observed from Earth.

For Polaris, which is near the north celestial pole, its apparent motion is tied to the Earth’s rotation and the observer’s latitude.

In surveying terms, when observing at western elongation, the star’s azimuth changes most rapidly, and this position is often used for precise astronomical observations to determine direction.