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Science. 1963 Mar 8;139(3558):910-1.

Rotation of Venus: Period Estimated from Radar Measurements.

Abstract

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.

PMID:
17743054
DOI:
10.1126/science.139.3558.910
[PubMed]
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