Polaris & Sky rotation - Celestial north pole - Time Lapse

This video shows how the sky is rotating around a point in the Northern hemisphere called Celestial North Pole, that is very close to Polaris, a bright star belonging to Ursa Minor.

Celestial poles, north and south, are the two imaginary points where the axis of rotation of the Earth intersects the celestial sphere, imaginary sphere of stars.

At night, stars appear to rotate from east to west. The path that describes each star is circular, with center at one of the celestial pole (north or south, depending on the hemisphere where the observer is located). This movement, is due to rotation of the Earth.

Celestial poles are the poles of the equatorial coordinate system, meaning that they are the points that have declinations +90 ° and -90 ° north and south, repectively.

Due to the effect of the precession of the equinoxes, the celestial poles move in relation to the stars and, consequently, the North Star (ie, the star closest to the pole) of each hemisphere is not the same across years as opposed to the North Star. Currently, the North Star Northern Hemisphere is at the top of the "tail" of Ursa Minor, named "Polaris" or Ursae Minoris, a distance of less than one degree to the pole. Polaris will someday in the future not be the polar star again up to about 25,780 years later.

By 1930, the celestial pole passed by a star of magnitude 11, which was for some years the name "Polarisim" Currently the pole goes away from it at 20" per year.

The precession period is 25,780 years and it is decreasing. Moreover, the poles of the ecliptic, around which move the celestial poles, are not invariable, as the ecliptic plane changes slowly due to disruptions to the Earth by other planets.

Category:

Science & Technology

Tags:

• Polaris
• North pole
• sky
• rotation
• astronomy
• astrophotography
• celestial
• time lapse
• stars
• movement

[AlienshateU]

Polaris still dead center?

[CumputerPhysiscsLab]

@AlienshateU Yes, Polaris is the bright star in the middle of the pictures.

[xPEACHxEATERx]

@byranmichelle D'oh!

[byranmichelle]

You're soo very correct the way you worded it in the discription.....its the stars going around the Earth :-)