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The astronomy It is the science that deals with the celestial bodies of the Universe, including planets and their satellites, comets and meteoroids, stars and interstellar matter, star systems called galaxies and clusters of galaxies.
Astronomy is one of the oldest sciences. At the dawn of civilization, man realized that the regular repetition of celestial phenomena constituted the natural clock of his multiple activities: the workday was measured by sunrise and sunset; the month, for the lunar cycle; plantings, crops and agricultural work in general were regulated by the approach of the seasons.
In ancient villages, the stars were considered as divinities and the study of their positions was essential to determine their influences on earthly events. For this set of reasons astronomy was, in all civilizations of the past, a science at the service of both civil and religious power.
Modern astronomy is divided into several branches: astrometry, the study by observing the positions and movements of these bodies; celestial mechanics, the mathematical study of its movements explained by the theory of gravity; astrophysics, the study of its chemical composition and physical condition through spectral analysis and the laws of physics, and cosmology, the study of the Universe as a whole.
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