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SCIENCE

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Physical - Astronomy

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Planets with the Longest Orbital Period

This list features the planets in our solar system with the longest orbital periods.

RANK

PLANET

ORBITAL PERIOD

YEAR EQUIVALENT

1

Mercury

88 days

0.24 years

2

Venus

225 days

0.62 years

3

Earth

365 days

1 year

4

Mars

687 days

1.88 years

5

Jupiter

4,333 days

11.86 years

6

Saturn

10,759 days

29.63 years

7

Uranus

30,687 days

84.01 years

8

Neptune

60,190 days

164.79 years


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References

NASA (n.d.) Planet sizes and locations in our solar system. Available at: https://science.nasa.gov/solar-system/planet-sizes-and-locations-in-our-solar-system/ [Accessed 1 December 2025]. NASA Space Place (n.d.) Years on other planets. Available at: https://spaceplace.nasa.gov/years-on-other-planets/en/ [Accessed 1 December 2025].
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