Points where Earth's poles would intersect with the celestial sphere if extended toward infinity. The north celestial pole resides at a declination of +90 degrees. Polaris resides less than one degree from the celestial north pole, hence its nickname the North Star. The south celestial pole is at a declination of -90 degrees. There are no bright stars near this position.
The Earth's orbit around the Sun takes approx. 365.25 days, and a 'day' is, of course, defined as the Earth spinning once on its axis. The Earth's axis of rotation, tilted at 23.5 degrees to the line of the poles of the ecliptic, gives us the directions to the north and south celestial poles. The bright star Polaris is currently showing us the direction of the north celestial pole. Like a spinning top this axis is precessing around the ecliptic pole, with a period of some 26,000 years