Polaris was the continuous guide for explorers and navigators in the northern hemisphere for thousands of years, and thus its other name, the famous North Star. It is important as it is located near the northern rotational axis of the Earth, and it seems that the whole sky revolves around it. But this was not always, and it will not always be. The slow pivotal fluctuation of the planet, called Precession, makes Trace Trace a circle every 26,000 years, making different stars throughout the ages.
How the 26,000 -year -old axial accuracy has turned into the northern star over time
According to NassaThe forces of gravity from the sun and the moon affect the rotation of the Earth; This produces swelling in the equator and axial mass. Every 26,000 years or so, this swaying makes a complete circle, and makes the heavenly pole move in a cycle, pointing to the stars in the sequence over time. Dhamban, in the constellation of the star Draco, was the closest visible in the sky to the heavenly pole for about 4,700 years. The stars, such as Kochaab and Perkad, were the closest to the pole about 3000 years ago. Polaris now has the title, but not for a long time.
The Earth axis will eventually change again, making the new stars in a prominent place. About 2,200 years, Erai in the conselllation cepheus will become the northern star. Al -Adraida, likewise in Sevius, will be its role about 5,000 years from now. DENEB, which will deal with the electrode again about 9800 m, and Vega, the former pole star, returns in about 12,000 years, completed this course.
Many of these stars are suitable for the specified constellations, including Cepheus, Draco and Ursa Minor. Modern stars applications that include augmented reality Night sky Mobility allows amateur astronomers to track their positions.
As Polaris continues to shine today, his rule is only temporary. The 26,000 -year -old fixed cycle ensures that other stars will eventually take their place, which proves that even in the universe, the change is fixed.
