Venus takes about 243 Earth days to spin once on its axis, longer than its 225-day year, although because it spins backward the Sun rises there about every 117 Earth days.
Notes on verification
Verified through NASA planetary data and radar mapping missions to Venus
Sources
- https://www.universetoday.com/articles/rotation-of-venus (universetoday.com)
- https://spaceplace.nasa.gov/all-about-venus/en/ (spaceplace.nasa.gov)
- https://www.britannica.com/place/Venus-planet (britannica.com)
- https://www.aeronomie.be/en/encyclopedia/venus-backwards-rotation-and-orbital-period (aeronomie.be)
- https://en.wikipedia.org/wiki/Venus (en.wikipedia.org)
- https://www.space.com/venus-atomphere-slows-down-rotation (space.com)
- https://science.nasa.gov/venus/venus-facts/ (science.nasa.gov)
- https://www.asc-csa.gc.ca/eng/astronomy/solar-system/venus.asp (asc-csa.gc.ca)