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Published online by Cambridge University Press: 04 August 2017
The theory of the motion of Halley comet has been built using ground optical positional observations of 1682, 1759, 1835, 1910 and 1982–84. The orbital elements of the comet and two coefficients characterizing non-gravitational perturbations were determined precisely as a result of the statistical treatment of the observations. The estimations of the accuracy of the theory and the data describing its agreement with the observations are presented. The theory has been applied to ballistic-navigational calculations for the Soviet Vega project.