Which planet has a year that is shorter than its day?

Answer 1

There is some confusion on this matter. Because of its spin-orbit resonance and fast orbit, an observer on Mercury would see only one day every two years. Venus has the slowest rotational period of any planet in our solar system at 243 days, and it completes an orbit in 224 days, so its sidereal day is longer than its year - but note that because of its retrograde motion (it rotates upside down, or spins the opposite direction it orbits), an observer of Venus would see almost two days per Venusian year, so its solar day is shorter than Mercury's.

Answer 2

Technically a year is based on a planets own orbit around the sun and the time it takes to do so. Each planet takes its own "year" to orbit the sun. However, based on how you specifically asked the question and as compared to Earth's year or s.r.p. meaning - Sidereal Revolution Period... the answer is both Mercury (88.0 earth-days or s.r.p.) and Venus (225 earth-days or s.r.p.). FYI: Jupiter takes 11.9 earth-years or s.r.p.)

Answer 3

the planet is venus. a day on venus is equal to 243 Earth days but a year on venus is only equal to 224 or 225 Earth days.

Answer 4

• VENUS

Answer 5

Mercury and Venus both have shorter annual periods than the Earth.

Answer 6

Mercury and Venus.

Answer 7

Venus