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Write short notes on constellations.

 A constellation is a  in the night sky when viewed from the Earth. International Astronomical Union has classified constellations to cover the entire celestial sphere. Many of the  have Greek or Latin names and are often named after mythological characters.
 
 is a large constellation and it covers a large part of the sky. The most striking feature of this constellation is a group of  known as .
 
 in Lattin means ‘the little bear’ it lies in the northern sky. The Pole star – Polaris lies within this constellation. The main group, ‘’, consists of seven stars.
 
Orion was a hunter in Greek mythology. The constellation comprises around  stars out of which all but are too faint to be seen with naked eye.
 
Different constellations become visible in the sky at different times in the year. This happens due to the revolution of the .