Polaris+2A

Polaris, also known as the Noth Star, marks the North Celestial Pole,it is the brightest star in the constellation Ursa Minor. People in the Northern Hemisphere mark Polaris as there benchmark, the elevation above the horizon is closely equal to the observer's latitude. Polaris is really not equal with the North Pole. It has a tiny circle around it about 1.5 degrees. Polaris is in the constellation, The Little Dipper, and it is the handle of the dipper. In thousands of years, Polaris will not be lined up with the pole, so a different star will take Polaris' place.

Polaris is also a Cepheid variable star, what it means is it changes from bright to dim. Nobody knows what kind of Cepheid variable Polaris is. The radius of Polaris is about 46 times that of the sun.The star pulsates causing it to change its brightness by a few percent over a few days. Polaris is part of the spectral class F, it is a bright yellow