SCIENCE

Physical - Astronomy

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].

SCIENCE

Physical - Astronomy

Planets with the Longest Orbital Period

References

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