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Whitepaper #086 submitted to the Planetary Science and Astrobiology Decadal Survey 2023-2032. Topics: atmospheric/exospheric evolution; interior evolution and volcanism; Venus
I describe science questions, challenges, and recommendations associated with measurements of the moment of inertia and length-of-day variations of Venus. Continued spin state observations of Venus with Earth-based radar speckle tracking offer considerable potential to elucidate both the interior structure and atmospheric dynamics of Venus.