One of the biggest difficulties in astronomy is establishing the limits of observational errors in order to avoid inadequate or incorrect interpretation of data. This requires a thorough understanding of the methods used by astronomers used to calculate distances, diameters, temperatures ages and other parameters and an ability to assess their reliability. Such methods range from the simplest techniques, which have been used since ancient times, to extremely sophisticated computer based techniques. Both have their uses, and the simple methods are still used today to give a first approximation.
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