A single day on Venus lasts longer than its entire year.

Venus orbits the Sun at a distance of about 108 million kilometers. According to NASA, it takes Venus 224.7 Earth days to complete one orbit. However, its sidereal day, which is the time it takes to spin once on its axis, is 243.02 Earth days. This means its day is about 18 Earth days longer than its year.Venus also spins backward compared to most other planets. This is called retrograde rotation. If you stood on Venus, the Sun would rise in the west and set in the east. Because of this backward spin, the time from one sunrise to the next is actually shorter, lasting about 117 Earth days.The planet's rotation speed is not always the same. In 2012, the European Space Agency's Venus Express found that the planet was spinning 6.5 minutes slower than it was in the 1990s. Scientists like Gerald Schubert believe the planet's thick atmosphere is the reason. The air on Venus is 93 times heavier than Earth's atmosphere. This creates massive pressure, similar to being 900 meters deep in the ocean. This heavy air drags against the surface and acts like a brake, slowing the planet down over millions of years. Some researchers also think a giant space rock hit Venus long ago and changed its spin forever.