![moon appears in sky time jagannatha hora moon appears in sky time jagannatha hora](https://lh5.googleusercontent.com/-Tq7z5caIwxA/TpTawJb0bsI/AAAAAAAACyk/J8Z_4z5jhRA/s512/karate%252520%25252822%252529.jpg)
The precession of the Earth is not entirely regular due to the fact that the Sun and Moon are not in the same plane and move relative to each other, causing the torque they apply to Earth to vary. The south pole is in a particularly bland portion of the sky, and the nominal south pole star is Sigma Octantis, which, while fairly close to the pole, is even weaker than Thuban - magnitude 5.5, which is barely visible even under a properly dark sky. The south celestial pole precesses too, always remaining exactly opposite the north pole. It is close enough for most practical purposes, though.
![moon appears in sky time jagannatha hora moon appears in sky time jagannatha hora](https://lh3.googleusercontent.com/-_bIRDN_EOrA/TpTbqVVt3ZI/AAAAAAAADBE/jZ4LNr6Ga4I/s512/karate%252520%252528127%252529.jpg)
Polaris is not exactly at the pole any long- exposure unguided photo will show it having a short trail.
![moon appears in sky time jagannatha hora moon appears in sky time jagannatha hora](https://images.news18.com/ibnlive/uploads/2021/05/1621160214_untitled-design-95.png)
to stand up more vertically in regards to the ecliptic plane, while the torque on a top spinning on a hard surface acts in the sense of trying to make the top fall over, rather than to stand up straighter. The reason is that the torques imposed on the Earth by the Sun and Moon act in the sense of trying to align its axis normal to the ecliptic, i.e. This sense of precession, against the sense of Earth's own axial rotation, is opposite to the precession of a top on a table. When standing on Earth looking outward, the axis appears to move counter-clockwise across the sky. When viewed looking down onto the Earth from the north, the direction of precession is clockwise. The brightest star known to have been North Star or to be predictable as taking that role in the future is the brilliant Vega in the constellation Lyra, which will be the pole star around the year AD 14,000. On the other hand, in 3000 BC the faint star Thuban in the constellation Draco was the pole star at magnitude 3.67 it is five times fainter than Polaris today it is all but invisible in light-polluted urban skies. Polaris is not particularly well-suited for marking the north celestial pole, as its visual magnitude, which is variable, hovers around 2.1, fairly far down the list of brightest stars in the sky. The portion of the precession due to the combined action of the Sun and the Moon is called lunisolar precession. The explanation of this is: The axis of the Earth undergoes precession due to a combination of the Earth's nonspherical shape (it is an oblate spheroid, bulging outward at the equator) and the gravitational tidal forces of the Moon and Sun applying torque as they attempt to pull the equatorial bulge into the plane of the ecliptic. The shift is 1 degree in 180 years (the angle is taken from the observer, not from the center of the circle). Over this cycle the Earth's north axial pole moves from where it is now, within 1° of Polaris, in a circle around the ecliptic pole, with an angular radius of 23 degrees 27 arcminutes, or about 23.5 degrees. The Earth goes through one complete precession cycle in a period of approximately 25,800 years, during which the positions of stars as measured in the equatorial coordinate system will slowly change the change is actually due to the change of the coordinates.