Do You Know: Which Planet Has the Longest Year?

Last Updated: Sep 24, 2026, 11:23 IST

Do you know which planet has the longest year? Learn why Neptune takes about 165 Earth years to orbit the Sun, along with facts about its day, seasons and distance.

Do You Know: Which Planet Has the Longest Year?
Do You Know: Which Planet Has the Longest Year?

Have you ever thought which planet takes the longest time to complete one revolution around the Sun? Among the eight planets in our Solar System, Neptune has the longest year and is the first largest planet. It takes approximately 164.8 Earth years to complete one orbit around the Sun. Keep reading to know

Which Planet Has the Longest Year?

Neptune has the longest year among the eight planets. One year on Neptune lasts approximately 164.8 Earth years. Neptune is the eighth and farthest planet from the Sun. It takes nearly 165 Earth years to complete one revolution around the Sun.

How Long Is One Year on Neptune?

Neptune takes nearly 165 years on Earth to complete one orbit. Neptune’s orbital period is much longer than that of any other planet in the Solar System.

Why Does Neptune Have the Longest Year?

Neptune is the farthest planet from the Sun. Its orbit is therefore much larger than those of the other planets. Neptune also travels around the Sun at a lower average orbital speed than Earth.

Which Planet Takes the Longest Time to Orbit the Sun?

Neptune takes the longest time to orbit the Sun. It requires about 164.8 Earth years for one complete revolution. Uranus has the second-longest orbital period at about 84 Earth years. Saturn takes approximately 29.5 Earth years. Jupiter takes about 11.9 Earth years.

Which Planet Has the Shortest Year?

Mercury has the shortest year among the eight planets. One Mercury year lasts approximately 88 Earth days. Mercury is the closest planet to the Sun. Its smaller orbit allows it to complete a revolution much faster than Neptune.

Neptune vs Other Planets: Which Has the Longest Year?

Planet Approximate Orbital Period
Mercury 88 Earth days
Venus 225 Earth days
Earth 365 days
Mars 687 days
Jupiter 11.9 Earth years
Saturn 29.5 Earth years
Uranus 84 Earth years
Neptune 164.8 Earth years

Does Neptune Have Seasons?

Neptune experiences seasons. Its rotational axis is tilted by approximately 28 degrees. This axial tilt is similar to Earth’s. But Neptune’s seasons are extremely long because its year lasts nearly 165 Earth years. Each season lasts roughly four decades.

Farthest Planet From the Sun

Neptune is the eighth and farthest planet from the Sun. Its distance from the Sun is one of the major reasons for its long orbital period.

Why is Neptune called Ice Giant?

Neptune is called an ice giant. It is different from rocky planets such as Earth and Mars. Its atmosphere contains mainly hydrogen and helium along with methane. Uranus is the other ice giant in the Solar System.

How Many Moons Does Neptune Have?

Neptune has 14 known moons. Its largest moon is Triton. It is the only large moon in the solar system with a retrograde orbit (moving opposite to the planet's rotation).

Neptune vs Earth: Length of a Year

Feature Earth Neptune
Position from Sun 3rd 8th
Length of year 365.25 days About 164.8 Earth years
Average distance from Sun About 150 million km About 4.5 billion km
Length of day About 24 hours About 16 hours
Planet type Rocky planet Ice giant

Jasreet Kaur
Jasreet Kaur

Executive - Editorial

Jasreet Kaur is a journalist with over 3 years of experience in digital media and news content creation. She specializes in covering Trending News, including major National and International developments, with a focus on delivering accurate, engaging, and reader-friendly stories. Prior to this, she worked with Zee News as a Content Writer, where she gained extensive experience in news reporting and content strategy. Driven by curiosity, credibility, and a passion for impactful journalism, Jasreet aims to contribute to informed public discourse while supporting positive growth in organizations, society, and the world.

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First Published: Sep 24, 2026, 11:23 IST

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