Zodiac is the band that passes round the celestial sphere, extending 9 degrees on either side of the eliptic. It includes the apparent paths of the sun, the moon and the eight major planets of the solar system. The band is divided into 12 signs of zodiac, each 30 degrees wide. These signs indicate the sun's position each month in the year and were named by the ancient Greeks after the zodiacal constellations that occupied the signs 2000 years ago.
A star is a self-luminous celestial body, such as the sun, that generates nucleur energy within its core. Stars are divided in groups on tye basis of the colour and srface temperature. The stages of life of a star depends on ythe basis of its mass.