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updated 17 Oct 2026
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the claim

A day on Venus is longer than its year.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
6 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that a day on Venus is longer than its year?

Yes. Multiple sources, including a Snopes fact-check, a NASA page, and astronomy references, state that Venus rotates once in about 243 Earth days while orbiting the Sun in about 225 Earth days, so a Venus day is longer than a Venus year.

Verdict: SUPPORTED · 6 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 6
One Day on Venus Is Longer Than a Year on Venus?
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One Day on Venus Is Longer Than a Year on Venus?. (n.d.). snopes.com. https://www.snopes.com/fact-check/one-day-on-venus-is-longer-than-a-year-on-venus/

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More for · 5
A book of Venus for you
1970
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None (1970). A book of Venus for you. archive.org. https://archive.org/details/bookofvenusforyo0000unse

Mercury, Venus, Earth and Mars
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Gregory, V. (n.d.). Mercury, Venus, Earth and Mars. archive.org. https://archive.org/details/mercuryvenuseart0000vogt_m1a4

encyclopedia-of-astronomy-and-astrophysics-4-volumes-2001
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encyclopedia-of-astronomy-and-astrophysics-4-volumes-2001. (n.d.). archive.org. https://archive.org/details/encyclopedia-of-astronomy-and-astrophysics-4-volumes-2001

All About Venus | NASA Space Place – NASA Science for Kids
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All About Venus | NASA Space Place – NASA Science for Kids. (n.d.). spaceplace.nasa.gov. https://spaceplace.nasa.gov/all-about-venus/en/

Venus' cloud top wind study: new Doppler velocimetry measurements
2024
Get citation
Venus' cloud top wind study: new Doppler velocimetry measurements. (2024). doi.org. https://doi.org/10.5194/epsc2020-307

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