Which star is directly above North Pole?

Appeared in: NIA - 29 January 2023

Explanation

Polaris is known as the North Star or Pole Star.
It is located less than 1 degree away from the north celestial pole, the point in the sky directly above Earth's rotational axis.
Due to its fixed position, it has been a crucial reference point for navigation in the Northern Hemisphere for centuries, as it indicates the direction of True North.
The altitude of Polaris above the horizon is approximately equal to the observer's latitude.

Option B: Sirius is incorrect because it is known for being the brightest star in the night sky, not for its position near the celestial pole. It is located in the constellation Canis Major.
Option C: Vega is a very bright star in the constellation Lyra, but it is not the current North Star. Due to the precession of Earth's axis, it was the pole star thousands of years ago and will be again in the distant future.
Option D: Capella is one of the brightest stars in the sky, located in the constellation Auriga. However, it is not situated near the north celestial pole and has no special significance for navigation.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of the North Star (Polaris) as background academic context rather than a clinical decision trigger.
Navigational Importance: For centuries, sailors and travelers in the Northern Hemisphere have used Polaris to determine direction, as it reliably marks the position of True North.
Latitude Estimation: A practical application of astronomy is that the altitude (angle above the horizon) of Polaris is almost exactly equal to the observer's latitude. For example, at 45°N latitude, Polaris is 45° above the horizon.
What if? If you were at the North Pole (90°N latitude), Polaris would be directly overhead (at the zenith). If you were at the equator (0° latitude), Polaris would be on the horizon.

How to Approach the Question

Identify the core question: The question asks for the specific star located above the North Pole.
Recognize this as a factual recall question from general knowledge (astronomy).
Access your knowledge about major stars. Recall the definition of the 'North Star' or 'Pole Star'.
Evaluate the options based on this knowledge:
Polaris is famously known as the North Star.
Sirius is known for being the brightest star.

Concept Tested & Keywords

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Practise the full NIA - 29 January 2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.