See more. astronomy definition: 1. the scientific study of the universe and of objects that exist naturally in space, such as the…. The subject areas of this dictionary at the time of this writing are among the most active of the physical sciences. Difference between astrology and astronomy in the simplest form is this; astronomy is a science while astrology is considered a pseudo-science by modern scientists. 2. Stonehenge is a famous example. They sighted through the monument to a large stone placed at a distance, the heelstone, to identify the day of the summer solstice. Biology, study of living things and their vital processes that deals with all the physicochemical aspects of life. Modern physics is a branch of physics that is mainly concerned with the theory of relativity and quantum mechanics. in modern astronomy, any one of the sections into which the celestial sphere is divided in order to facilitate orientation in the stellar sky. Astrology, type of divination that involves the forecasting of earthly and human events through the observation and interpretation of the fixed stars, the Sun, the Moon, and the planets. Observational astronomy, which was the main form of astronomy elsewhere, was taken a step further in Greece: they attempted to build a model of the universe that could account for the observations.They explored all imaginable alternatives, they considered many different solutions for the various astronomical … Constellation definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Astrophysics definition is - a branch of astronomy dealing especially with the behavior, physical properties, and dynamic processes of celestial objects and phenomena. cosmology and Star Trek. Astrophysics and astronomy are enjoying a new golden era, with remarkable observations in new wave bands (γ-rays, X-rays, infrared, radio) and in new fields: neutrino and (soon) gravitational wave astronomy. In antiquity, however, constellations were the symbolic figures formed by bright stars. Among other things, it was used to identify the first day of summer, the "summer solstice. Astrology is widely considered today to be diametrically opposed to the findings and theories of modern Western science. In modern astronomy, the leading cosmology is still the Big Bang theory, which claims that the universe began with a huge explosion that sent matter and energy spreading out in all directions. Learn more. Modern Physics. Astronomy is an area where the Greeks displayed a remarkable talent. Modern principles of other fields, such as chemistry, medicine, and physics, for example, are integrated with those of biology in areas such as biochemistry, biomedicine, and biophysics. 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