THE summer solstice marks the longest day of the year and the astronomical start of summer - but when is the summer solstice here in the UK? The gas giants rotate really fast. Its day lasts longer than its orbit. Planet Mercury has the longest day of any planet in the solar system at 176 Earth days long. ET on Saturday, June 20, according to NASA. The planet Jupiter has the shortest day of all the eight major planets in the Solar System. So, the day is actually longer than a year, which means that Venus residents would only get to see two sunrises per year. Jupiter takes just 10 hours to complete one rotation.

It is around 365.242199 days long, but varies slightly from year to year because of the influence of other planets. This will not be the longest solar day of the year as some solar days in December will be longer. Earth takes 24 hours to complete one spin, and Mars takes 25 hours. Jupiter has a small axial tilt of only 3.13 degrees, meaning it has little seasonal variation during its 11.86-year-long orbit of the Sun.

However, if you choose a wierd way of defining a day, then Venus has the longest day. Which Planet in our solar system has the highest percentage of oxygen? Which planet has the shortest year and the longest day in the solar system? Which planet has the fastest orbiting speed in our solar system?

The 2020 summer solstice will occur at 5:43 p.m. On Earth and Mars it’s very similar. ... As the planet … On Mercury a day lasts 1,408 hours, and on Venus it lasts 5,832 hours. It spins around on its axis once every 9 hr 55 min 29.69 sec. Planet Venus spins so slowly on its axis that one day on the planet lasts nearly 243 Earth days. Friday morning, June 19, the thin, waning crescent Moon will appear low on the east-northeastern horizon about half a degree to the lower left of the bright planet Venus.

Because it's closer to the Sun than Earth is, the planet has a 225-day year. It orbits the Sun every 224.65 Earth days… It completes one rotation every 243 Earth days. Venus and which other planet in our solar system has no moon?

So, Venus has the longest day of any planet in our solar system. June Solstice: Longest and Shortest Day of the Year. June 19.