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SCIENCE

The Claim

A single day on Venus is longer than a year on Venus.

Verified by Lenz ·

The Short Version

This claim is accurate under the standard definition used by NASA and other major space agencies: Venus's sidereal day (one full axial rotation) takes ~243 Earth days, while its orbital year takes only ~224.7 Earth days. However, the claim omits an important nuance: Venus's *solar* day (sunrise to sunrise) is only ~116.75 Earth days — shorter than its year — due to Venus's retrograde rotation. The unqualified word "day" creates ambiguity, but the dominant scientific framing supports the claim.

Caveats

  • The claim does not specify whether 'day' means sidereal day (~243 Earth days) or solar day (~116.75 Earth days). Under the solar day definition, a day on Venus is actually shorter than a Venusian year, reversing the claim.
  • Venus rotates in a retrograde (backward) direction, which causes its solar day to be dramatically shorter than its sidereal day — a critical nuance the claim omits entirely.
  • While NASA and other agencies commonly use the sidereal rotation period when making this comparison, the everyday meaning of 'day' (sunrise to sunrise) would not support the claim.

The Receipts

  1. Venus: Facts - NASA Science

    NASA Science

  2. Venus - CNES

    CNES

  3. Venus' orbit and visibility - day, night and seasons on Venus - ESO.org

    ESO.org

  4. Venus, backwards rotation and orbital period | Royal Belgian Institute for Space Aeronomy

    Royal Belgian Institute for Space Aeronomy

  5. Venus | Canadian Space Agency

    Canadian Space Agency

  6. How Long is a Year on Other Planets? | NASA Space Place

    NASA Space Place

  7. How Long Is One Day on Other Planets? | NASA Space Place

    NASA Space Place

  8. Why is a day on Venus is longer than a year? The atmosphere may be to blame. | Space

    Space

  9. How long is a year on Venus? - Te Awamutu Space Centre

    Te Awamutu Space Centre

  10. Interesting facts about Venus | Royal Museums Greenwich

    Royal Museums Greenwich

+ 5 more sources — see the full list on Lenz

Filed Under

Venus

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