Astronomers on Earth are able to measure the rotation of Venus by using optical telescopes to watch surface markings as rotation carries them across the disk of Venus.

Name: Astronomers on Earth are able to measure the rotation of Venus by using optical telescopes to watch surface markings as rotation carries them across the disk of Venus.
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Astronomers use radar mapping to measure the rotation of Venus because its thick cloud cover prevents direct optical observation of surface markings.

Astronomers on Earth Are Able to Measure the Rotation of Venus