Which planet has the longest day?

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Today’s topic is fascinating as it is devoted to the longest day on a planet or, better to say, which one has the longest day. We are going to give an answer to this big question and find out which planet has the longest day. Some people always complain since the time is not enough, but what they would say if they had an opportunity to live on another planet. Let’s discover together which one has the longest day. 

But before passing on the topic, we will explain to you what it means to say one day on the planet. The length of time it takes for the planet to complete one spin on its axis determines its day. It is also known as the rotational period of the planet.

  • Mercury: 58 days and 15 hours
longest day
58 days and 15 hours
  • Venus: 243 days
Which Planet Has the Longest Day in Our Solar System?
243 days
  • Mars: 24 hours, 39 minutes and 35 seconds
Which Planet Has the Longest Day in Our Solar System?
24 hours, 39 minutes and 35 seconds
  • Jupiter: 9.9 hours
Which Planet Has the Longest Day in Our Solar System?
9.9 hours

It takes 10 hours 45 minutes 45 seconds for Saturn, although this can only be estimated due to the atmosphere’s density.

Which Planet Has the Longest Day in Our Solar System
10 hours 45 minutes 45 seconds, but can only be approximated because of atmospheric density
  • Uranus: 17 hours, 14 minutes and 24 seconds
17 hours, 14 minutes and 24 seconds
17 hours, 14 minutes and 24 seconds
  • Neptune: It takes 16 hours, 6 minutes, and 36 seconds for Neptune to complete one spin on its axis. To fully understand the varied days on Neptune, we need to do further study on the planet. 
Which Planet Has the Longest Day in Our Solar System?
16 hours, 6 minutes and 36 seconds. You need to do more research on the planet to completely understand the varying day on Neptune

So, based on the facts, Venus possesses the solar system’s longest day. It completes one rotation every 243 Earth days. In other words, it has a day that lasts longer than its orbit does. It circles the Sun every 224.65 Earth days, which means that a day is roughly 20 Earth days longer than a year.

A solar day on Earth lasts around 24 hours, according to NASA. On the other hand, the Earth’s orbit is elliptical, which means it is not a complete circle. It explains that certain solar days on Earth are slightly longer than 24 hours, while others are somewhat shorter. 

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