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( Observational astronomy)
Observational astronomy is a division of the astronomical science that is concerned with getting data, in contrast with theoretical astrophysics which is mainly concerned with finding out the measurable implications of physical models. It is the practice of observing celestial objects by using telescopes and other astronomical apparatus. As a science, astronomy is somewhat hindered in that direct experiments with the properties of the distant universe are not possible. However, this is partly compensated by the fact that astronomers have a vast number of visible examples of stellar phenomena that can be examined. This allows for observational data to be plotted on graphs, and general trends recorded. Nearby examples of specific phenomena, such as variable stars, can then be used to infer the behavior of more distant representatives. Those distant yardsticks can then be employed to measure other phenomena in that neighborhood, including the distance to a galaxy. Prior to the discovery of the telescope, early observational astronomy relied upon the unaided eye and various instruments for measuring time and direction. The medieval Muslim astronomers and Tycho Brahe were noted for their systematic observations of the heavens. The data collected by Brahe was used by Johannes Kepler to build his laws of planetary motion. The heavens have been regarded by humans for much of recorded history. Ancient stone structures were built as a means of measuring the passage of time based on the movements of the Sun. Constellations were specific patterns of stars in the sky that came to be associated with particular seasons on the Earth, as well as much lore and mythology.
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Observational astronomy Subcategories
Observational astronomy Articles
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