Space
Is a day on Venus longer than a year on Venus?
The short answer
Yes. Venus takes about 243 Earth days to spin once on its axis, but only about 225 Earth days to travel all the way around the Sun. A Venusian day is longer than a Venusian year.
The two numbers we casually call a day and a year measure completely unrelated things: one is a planet spinning, the other is a planet orbiting. On Earth those happen to land 365 to 1, which is why we assume years contain days. Venus never agreed to that arrangement.
Venus rotates so slowly that a single turn takes roughly 243 Earth days, while a full lap around the Sun takes about 225. It also spins backwards compared to most of the solar system, so on Venus the Sun would rise in the west, if you could see it through the clouds at all.
Put together, the sunrise-to-sunrise day on Venus works out to around 117 Earth days, because the planet's orbital motion partly cancels its backwards spin. Every way you measure it, the calendar comes out wrong.
Source
- Venus: FactsNASA Science