Proceedings of IAU Symposium No. 89 held at Uppsala, Sweden, 1-5 August 1978Research into astronomical refraction today and tomorrow.- Refraction in radioastronomy.- Environmental systematics and astronomical refraction II.- An origin of the variations of astronomical refraction.- On astronomical refraction for a three-dimensional model atmosphere.- Les effets de la r?fraction atmosph?rique sur les coordonn?es tangentielles en astrom?trie.- Atmospheric turbulence effects on astrometric determinations.- On the calculation of refraction in model atmospheres.- Calculating astronomical refraction by means of continued fractions.- On the characteristics of astronomical refraction in the northern hemisphere.- Astronomical refraction at the Mizusawa Latitude Observatory.- Chromatic refraction in the vertical circle observation.- Discussion About Refraction Corrections in Star Catalogue Work and Geodetic Astronomy.- Two color refractometry, precision stellar catalogs, and the role of anomalous refraction.- Path length variations due to changes in tropospheric refraction.- Diurnal changes of radio refraction.- Use of meteorological measurements for computing refractional effects a review.- Statistics applied to the estimation of the influence of the environment on results of observations.- Evaluation of refraction by geodetic measurements.- Investigation on refraction in trigonometrical leveling traverses.- The accuracy of the determination of terrestrial refraction from reciprocal zenith angles.- Numerical filtering of refraction coefficients.- Vertical refraction angle derived from the variance of the angle-of-arrival fluctuations.- Results from an absolute test of the NPL dispersometer over 4 km.- Experiences from IDM measurements at the test base of the Geodetic Institute of Uppsala University.- Possibilities of increasing the accuracy in the determination of refractional angles with Tengstr?ms IDM.- Application of refractional effects in geodetic framework of Iraql3$
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