Abstract
Methods for determining the atmospheric extinction depend on the bandwidth which is defined in the first part of this paper. In the following section methods for monochromatic photometry are developed. Results obtained at the Cerro Tololo Inter-American Observatory during more than two years are discussed. These show that for this site the atmospheric extinction within the range from 3000 to 6000 Å is composed of a neutral component, a Rayleigh scattering component, and two ozone absorption bands. All three components are slightly variable. The third section is concerned with the atmospheric extinction in wide-band photometry. A semi-empirical method for the extinction determination is discussed, from which the classical methods can be derived by omitting higher order terms. The last section is concerned with secondary methods which either determine the extinction utilizing external data, or which neutralize its effect.
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