Rotation of Venus: Period Estimated from Radar Measurements

@article{Goldstein1963RotationOV,
  title={Rotation of Venus: Period Estimated from Radar Measurements},
  author={Richard M. Goldstein and Roland Carpenter},
  journal={Science},
  year={1963},
  volume={139},
  pages={910 - 911}
}
Venus may rotate in a direction opposite to that of the earth at a rate of only one revolution in 240 days. The estimated period is accurate within 20 percent if the axis of rotation of Venus is perpendicular to the plane of the planet's orbit. 
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References

Frank presented at the Mariner II symposium
  • Am. Geophys. Union meeting