The science which deals with the study of celestial objects like stars, planets, comets, star clusters and galaxies is said to be Astronomy. Astronomy is concerned with the evolution of celestial objects, as well as the formation and development of the universe. The word astronomy is derived from the Greek words “astron” which means star and “nomos” which means “law” or “culture”. Astronomy basically means that the law of the stars. In the early days our ancestors identified celestial objects with gods. They related the movements of the celestial objects to various phenomena like rain, drought, seasons and tides.

Another observation is interesting

BBC