* Polaris is aligned with Earth's axis: The North Star is almost perfectly aligned with Earth's rotational axis. This means it appears to stay in the same spot in the sky, while other stars circle around it.
* Latitude and visibility: The height of Polaris above the horizon is determined by your latitude. The further north you are, the higher Polaris will appear. Even at the equator, Polaris is still visible near the horizon.
* Earth's tilt: Because of Earth's tilt, Polaris is always visible to observers in the Northern Hemisphere.
What might be happening:
* You're in the Southern Hemisphere: The Southern Hemisphere has a different "pole star" (Sigma Octantis), but it's much fainter than Polaris and not as commonly used for navigation.
* You're observing near the horizon: While Polaris doesn't sink below the horizon, it can appear closer to it if you are in a location with a lot of light pollution, obstructions, or if the horizon is obscured.
In summary, seeing the North Star sink below the horizon is physically impossible for those in the Northern Hemisphere. If you think you've seen this, it's likely due to your location, the time of night, or other factors affecting visibility.
