The sky's almost-still point.

Polaris is not the brightest star in the night sky. Its usefulness comes from its position near the north celestial pole: the point towards which Earth's northern rotation axis extends. As Earth turns, stars appear to travel around that point. Polaris traces a small circle because it lies close to the centre, so it stays in roughly the same part of the northern sky.

In the Northern Hemisphere, the two stars at the outer edge of the Big Dipper's bowl help point towards Polaris. Polaris sits at the end of the Little Dipper's handle. Once you face it, you are facing approximately true north, rather than magnetic north. Its height above the horizon also changes as you travel north. At the North Pole it is nearly overhead; closer to the equator it lies close to the horizon. A star's placement can connect the sky to your position on Earth.

'North Star' is a role, not an eternal appointment. Earth's axis slowly wobbles, and the direction of the celestial pole moves over thousands of years. The full cycle takes about 26,000 years. Polaris has not always held the role and will not keep it forever. Looking up can therefore reveal two kinds of movement at once: the nightly turning that makes the stars seem to circle, and a slower change too long for one lifetime to watch. A point that feels fixed can be a temporary convenience on a moving planet.