how long is a day on uranus

How Long is a Day on Uranus in Earth Days / Hours / Years

Uranus, the seventh planet from the Sun, is a celestial marvel with its distinct sideways rotation and captivating blue-green hue. One of the intriguing aspects of Uranus is its day length, which sets it apart from other planets in our solar system. In this blog post, we will delve into the fascinating details of how long a day is on Uranus, the factors that contribute to this measurement, and the significance it holds in understanding this unique ice giant.

Defining a Day on Uranus

Before we explore the specific length of a day on Uranus, it's important to understand what constitutes a day on a celestial body. A day is the time it takes for a planet to complete one full rotation on its axis, resulting in a cycle of day and night. However, due to Uranus' distinctive characteristics, determining its day length presents intriguing challenges.

How Long is a Day on Planet Uranus in Earth Days / Hours / Years

Uranus has a unique rotation compared to most other planets in our solar system. It rotates nearly on its side, with an axial tilt of about 98 degrees. This extreme tilt results in some peculiar characteristics for a "day" on Uranus:

  • Uranian Day (Sidereal Rotation Period): Approximately 17.24 Earth hours.

So, a day on Uranus, measured by its sidereal rotation period, is approximately 17.24 Earth hours.

  • Hours: To convert this into hours, it is approximately 17.24hours.
  • Uranian Year: Uranus's year, or the time it takes to complete one orbit around the Sun, is about 84 Earth years.

It's important to note that the rotational axis of Uranus is nearly parallel to its orbital plane, so its poles experience long periods of sunlight followed by long periods of darkness during its orbit around the Sun. This unique rotational behavior contributes to the peculiar definition of a "day" on Uranus.

Uranus' Sideways Rotation

One of the defining features of Uranus is its unique sideways rotation. Unlike most planets, which rotate on a nearly vertical axis, Uranus spins on its side. This means that its axis of rotation is tilted at an angle of about 98 degrees relative to its orbit around the Sun. This peculiar orientation contributes to variations in Uranus' day length.

The Length of a Day on Uranus

Due to its tilted axis, a day on Uranus is quite long. Uranus takes approximately 17 hours and 14 minutes to complete one full rotation on its axis. This means that a day on Uranus is significantly shorter than Earth's 24-hour day.

Variations in Day Length

Uranus' day length varies across different latitudes due to its tilted axis. As one moves closer to the poles, the rotational speed of Uranus becomes slower, resulting in longer day lengths. Conversely, at the equator, where the rotational speed is highest, the day length is relatively shorter. These variations in day length contribute to the complex dynamics of Uranus' atmosphere and climate.

The Impact of Uranus' Tilt on Seasons

Uranus' extreme axial tilt influences its seasons in a unique way. During its 84-year orbit around the Sun, each pole experiences 42 years of continuous sunlight followed by 42 years of darkness. This prolonged exposure to sunlight or darkness affects temperature patterns and atmospheric circulation on the planet.

Exploring the Mysteries of Uranus' Day Length

Studying Uranus' day length provides valuable insights into the planet's rotational dynamics, atmospheric processes, and the forces at play within its icy interior. As we continue to explore Uranus through telescopes and future space missions, such as NASA's proposed Uranus Orbiter and Probe mission, we aim to deepen our understanding of this intriguing ice giant and unravel the mysteries surrounding its day length.


The day length on Uranus, lasting approximately 17 hours and 14 minutes, showcases the uniqueness of this icy giant in our solar system. Uranus' sideways rotation and tilted axis contribute to variations in day length across different latitudes. Understanding Uranus' day length expands our knowledge of planetary dynamics, atmospheric processes, and the complex interplay between a planet's orientation and its environment. As we continue to explore the wonders of Uranus, we inch closer to unraveling the mysteries of this enigmatic planet and broadening our understanding of the vast diversity of celestial bodies in our cosmic neighborhood.

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