Astronomers recognize 88 constellations of stars in the sky, including the 12 zodiac constellations. How are these constellations used by astronomers?

Astronomers use constellations to measure time. They study the revolution of the sun, the movements of planets and other heavenly bodies. Zodiac constellations lie in a pathway in which the sun travels in a year. The sun lies in each zodiac upon reaching the interval of one month.