Curious Facts Quizzes / Science · 3 questions
What do the three Venus periods measure?
Three questions cover rotation, orbit and the sunrise cycle.
No prior knowledge is needed. Choose an answer to see the explanation and evidence.
1Understanding
What does about 243 Earth days measure here?
Correct answer: One Venus rotation measured against the stars
The 243-day period measures one rotation of Venus.
Evidence: Measured against the stars, Venus rotates once in about 243 Earth days and orbits the Sun in about 225 Earth days. The 243-day period measures one rotation of Venus.
2Context
Using the same Earth-day units, which period is longer?
Correct answer: The roughly 243-day rotation
243 exceeds 225. The claim about a day exceeding a year uses the rotation period.
Evidence: In the same units, one rotation takes longer than one orbit. 243 exceeds 225. The claim about a day exceeding a year uses the rotation period.
3Understanding
What does about 117 Earth days measure?
Correct answer: One sunrise to the next
The sunrise cycle differs from the rotation period and is not daylight alone.
Evidence: One sunrise to the next takes about 117 Earth days. The sunrise cycle differs from the rotation period and is not daylight alone.
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Connected reading
Can a day on Venus be longer than its year?