On Venus, a full spin takes longer than a trip around the Sun. It sounds backward, but that is exactly how this neighboring planet works.
How long is a day on Venus?
Venus takes roughly 243 Earth days to rotate once on its axis. Its orbit around the Sun takes about 225 Earth days. That means one complete rotation—the planet’s sidereal day—is longer than its year.
There is an important catch: the time from one sunrise to the next is different from the time required for one rotation. Because Venus rotates backward relative to Earth, its solar day is about 117 Earth days. The Sun would appear to rise in the west and set in the east.
Venus is also the hottest planet in our solar system. Its thick atmosphere traps heat, making its surface profoundly hostile to spacecraft and humans.
The takeaway
On Earth, a day is much shorter than a year. On Venus, one axial rotation takes longer than one orbit. The distinction between a rotation and a sunrise-to-sunrise day makes the story even stranger.
Source: NASA Science — Venus Facts.