Points about which the celestial sphere appears to rotate; intersections of the celestial sphere with the Earth's polar axis.
Two points, the North Celestial Pole, and the South Celestial Pole, which are at the ends of the imaginary axis about which the sky appears to turn.
The two points where Earth's axis of rotation is projected onto the celestial sphere.
Projection of the terrestrial poles into the celestial sphere.
diametrically opposite points of the celestial sphere about which the heavens are observed to rotate once a day.
the Earth's north and south poles projected onto the sky
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.
Two points (north and south) in the celestial sphere which the sky seems to rotate around.
The projection of the Earth's poles onto the celestial sphere.
The North and South poles of the celestial sphere.
Directly above the planetary poles are fixed points in the sky around which the celestial sphere appears to slowly turn daily.
imaginary points marked on the celestial sphere by the extension of the Earth rotational axis.
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