What are the planets from longest year to shortest year?

Answer 1

The approximate day lengths (with "day" defined here as the rotation period of a planet) of the planets in the solar system are:

1. Mercury 1407.5 hours
2. Venus 2802 hours
3. Earth 24 hours
4. Mars 24.5 hours
5. Jupiter 10 hours
6. Saturn 10.5 hours
7. Uranus 17.25 hours
8. Neptune 16 hours

Note that the number for Uranus is its rotation period BUT Uranus spins "on its side". Thus the time it takes for sunlight to illuminate all parts of the planet depends on its orbital period round the Sun, which is 84 years or 735840 hours.

Answer 2

Jupiter: 9 hr, 55.55 min.

Saturn: 10 hr, 32.6 min.

Neptune: 16 hr, 6.6 min.

Uranus: 17 hr, 14.4 min.

Earth: 24 hr.

Mars: 24 hr, 39.6 min.

Venus: About 116.75 Earth days.

Mercury: About 176 Earth days.

These numbers are for the "solar day".

If you use the "sidereal day" for your definition of "day"

then Venus has a longer day than Mercury.

Answer 3

Jupiter, Saturn, Neptune, Uranus, Earth, Mars, Venus, Mercury.

That's for the "solar day".

If you mean "sidereal day", the order is the same except for the last two,

which are reversed, with Venus having the longest day.

Answer 4

Mercury or Venus is longest (depending on the definition of "day" used) and Jupiter is shortest.

Answer 5

Shortest : Jupiter.

Longest : Mercury or Venus, depending on which definition of "day" you use.