Estimation of the horizontal component of astronomical refraction in an ellipsoidal atmosphere

Statistics – Computation

Scientific paper

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Atmospheric Models, Atmospheric Refraction, Earth Atmosphere, Algorithms, Ellipsoids, Horizontal Orientation

Scientific paper

The paper presents an algorithm for the computation of the vertical and horizontal components of astronomical refraction for a homogeneous ellipsoidal earth atmosphere. For the atmosphere ellipsoid with parameters determined from measurements of the vertical component near the horizon, the maximum value for the horizontal refraction component is 0.1 arcsec at a zenith distance of 88 deg. The real atmosphere is approximated by a triaxial ellipsoid for which the maximum slope of the atmosphere in the zenith amounts to 0.3 arcmin.

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