# How long is a year on each planet?

Check out the table below to see how long a year lasts on each planet! Mercury. There are 88 Earth Days in a year. The Earth is 35 million kilometers away from the Sun. (58,000,000 kilometers) Venus. There are 225 Earth Days in a year. The Earth is 67 million miles away from the Sun. (117,000,000 miles) Mars. There are 686 Earth Days in a year. The Earth is average distance of 150 million miles from the Sun. (240,000,000 miles) Jupiter. There are 10,868 Earth days in a year. The Earth travels around the Sun at a speed of 564,000 km/year. Saturn. There are 17,347 Earth days in a year. The Earth takes 9.5 years to orbit Saturn.

Uranus. It takes 84 Earth years to orbit Uranus. Neptune. It takes 165 Earth years to orbit Neptune.

All of these times are very close to 12 months. This means that a year on these planets is almost exactly equal to 365.25 days.

In addition, every planet except Pluto has at least one moon. These range in size from 506,914 miles for Earth's Moon to 350,800 miles for Jupiter's moon Io.

Pluto used to be a part of the Planet Nine family until it was reclassified as a dwarf planet in 2010.

## What planet has the fastest year?

Mercury's Year:

• To put it simply, Mercury has an orbital period of 88 days (87.969 to be exact), which means a single year is 88 Earth days – or the equivalent of about 0.241 Earth years.
• The second closest planet to our Sun, Venus completes a single orbit once ever 224.7 days.

## Do all the planets in our solar system have the same number of days in a year?

The sun is also orbited by all of the other planets in our solar system. So, how long does a year last on such worlds? It all depends on where they're circling! Planets that circle the Sun closer to the Sun have shorter years than Earth. Those that circle farther from the Sun have longer years.

Earth's year is called an "orbital year". This means that the orbit of the planet around the Sun is exactly complemented by the rotation of Earth itself. Every 24 hours, the same part of the sky is rising and setting for someone living on Earth. Because of this exact alignment, one full cycle of the moon will be completed when the moon is again at its highest point during the day.

But what happens if the orbital period of a planet is not exactly complemented by its rotational period? Then there would be times when some parts of the world are in darkness while others are still illuminated by sunlight. For example, if Mars had only 39 days instead of 40, then there would be times when the Spirit and Opportunity robots were facing south toward the sunset while the southern polar cap was still in daylight!

However, because Mars has only 1/5th the mass of Earth, its year is always very close to being exactly complemented by Earth's own year. The difference between their years is called their "lunar eccentricity".

## Why are years on some planets longer than years on other planets?

The length of a year on any planet is determined by its orbit. Planets that rotate closer to the Sun than Earth have fewer days in a year, whereas those that rotate farther away have many more days in a year. Years follow the same pattern - they become longer as planets get closer to the Sun.

On Mars, for example, seasons occur because of differences in distance from the Sun. During solar minimum periods, the red planet is far enough from the Sun for its water ice to remain frozen throughout the year. As solar activity increases, so does the amount of radiation that reaches the Martian surface, which will eventually cause all of its water supplies to evaporate. Without an atmosphere to protect it, Mars would be completely barren within a few hundred million years.

Earth's yearly cycle is called "solar day". It is exactly 24 hours long, regardless of where you live on Earth. The time it takes the Sun to go from high noon to low noon is called an "hour". Because we are located about 870,000 miles out from the Sun, it takes us 9 minutes 34 seconds to reach lowest sun angle each day. This is why summer days are longer than winter days; during spring and fall, the Sun is at lower angles every day for more time than it is during winter when it is at highest point in the sky.

## How long is a day and a year on each planet?

While it takes the Earth 365 days to complete one circle, Mercury, the nearest planet, only takes 88 days... Our Lives in Days (and Years)

PlanetRotation PeriodRevolution Period
Venus243 days224.7 days
Earth0.99 days365.26 days
Mars1.03 days1.88 years
Jupiter0.41 days11.86 years

## How long is Mercury’s Day compared to Earth?

What Is the Length of a Day on Other Planets?

PlanetDay Length
Mercury1,408 hours
Venus5,832 hours
Earth24 hours
Mars25 hours

## How long does it take each planet to revolve around the sun?

It is worth noting that as the planet's distance from the sun increases, so does the period, or time required to complete one orbit... Our Days (And Years).

PlanetRotation PeriodRevolution Period
Mercury58.6 days87.97 days
Venus243 days224.7 days
Earth0.99 days365.26 days
Mars1.03 days1.88 years

## What makes each planet have a different year length?

Planets that orbit the Sun closer to the Sun have shorter years than Earth. Planets that circle the Sun farther away from the Sun have longer years than Earth. This occurs for two primary reasons. When a planet is close to the Sun, its orbit around the Sun is relatively brief. As a result, a planet on such a short orbit will see many of the stars it passes over during its orbit become visible from its surface again before it has had time to recede back out of sight.

The second reason has to do with how far away a planet is from the Sun. If a planet is very far from the Sun, then even though it has the same orbital period as Earth, which is about 365 days, because it takes it so long for Earth to make one full rotation around the Sun, this rotation is not enough to reach all parts of the planet at exactly the same time. So instead of having a single annual summer and winter, there are two distinct seasons: sunup and sundown. During these periods the direction of true north changes. The amount that it changes is called the polar axis tilt. Tilt ranges from 90 degrees (a complete rotation) to 0 degrees (straight up or down). The average tilt of the planets in our Solar System is 23.5 degrees. Tilt causes differences between regions on a planet. On Earth, they're known as the equator and the poles.

##### Amy Smith

Amy Smith is a healer. She has been working with the spirit world for over 30 years, and her work with spirits has grown into what she calls Spiritual Healing. Amy's goal is to provide healing energy to those who are lost in their own inner turmoil, as well as providing them guidance on how they can bring themselves out of this darkness.

#### Disclaimer

SpiritualWander.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.