Table 1: The accuracy of the reduction of planet observations in the systems of the PPM and Tycho-2 catalogues.
  (O-C) $_{\alpha}^{\rm S}$ (O-C) $_{\alpha}^{\rm S}$ rms $_{\alpha}^{\rm S}$ rms $_{\alpha}^{\rm S}$ (O-C)$_\delta''$ (O-C)$_\delta''$ rms $_\delta''$ rms $_\delta''$
Planets PPM Tycho-2 PPM Tycho-2 PPM Tycho-2 PPM Tycho-2
Venus -0.010 -0.008 $\pm0.028$ $\pm0.015$ 0.09 0.05 $\pm0.30$ $\pm0.20$
Mars 0.002 0.000 0.017 0.012 0.03 0.02 0.16 0.10
Saturn -0.005 -0.002 0.030 0.016 0.01 0.00 0.30 0.21
Uranus -0.023 -0.012 0.024 0.013 0.21 0.15 0.22 0.15
Neptune -0.025 -0.015 0.013 0.008 0.00 0.00 0.36 0.18
Pluto 0.145 0.117 0.057 0.031 -0.48 -0.48 0.33 0.24


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