Observational astronomy | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-25

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Observational_astronomy


00:01:11 1 Subdivisions
00:02:48 1.1 Methods
00:04:05 1.2 Important factors
00:06:53 1.3 Measuring results
00:07:47 2 Developments and diversity
00:08:19 2.1 Radio astronomy
00:09:24 2.2 Late 20th century developments
00:10:32 2.3 Other instruments
00:11:32 3 Observation tools
00:11:42 3.1 Telescopes
00:14:17 3.2 Photography
00:15:24 3.2.1 Advantages
00:16:08 3.2.2 Blink comparator
00:16:37 3.3 Micrometer
00:17:16 3.4 Spectrograph
00:18:43 3.5 Photoelectric photometry
00:20:03 4 Observing
00:22:30 5 See also
00:22:51 6 Related lists



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SUMMARY
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Observational astronomy is a division of astronomy that is concerned with recording data about the observable universe, in contrast with theoretical astronomy, which is mainly concerned with calculating the measurable implications of physical models. It is the practice and study of observing celestial objects with the use of telescopes and other astronomical instruments.
As a science, the study of 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.
Galileo Galilei turned a telescope to the heavens and recorded what he saw. Since that time, observational astronomy has made steady advances with each improvement in telescope technology.