1. What is the name of the star which is almost directly above the north pole of the Earth? Draw a diagram to illustrate how an observer in the northern hemisphere can locate this star.
It is the brightest star of the northern hemisphere, in the constellation of Ursa minor, being about 433 light-years.Its a triple star system with Polaris Aa, Ab and B star.
Due to Polaris stars, it lies in direct line with rotation of the earth on its axis above the celestial north pole. The temperature on the Polaris varies with a small amount of pulsation which is variable and unpredictable the temperature cycle can go from 50K to at least 170 K.
