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From the analysis of all available radiometric measurements of distances between the Earth and the major planets (including observations of martian landers and orbiters over 1971–2003 with the errors of few meters) the positive secular trend in the Astronomical Unit AU is estimated as $${{\rm d}\over{{\rm d}t}} {\rm AU} = 15 \pm 4 {\rm m/cy}$$ . The given uncertainty is the 10 times enlarged formal...
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