One day on Earth is equal to less than 24 hours. specifically 23 hours, 56 minutes and 4 seconds: is the time it takes to rotate on its own axis. But each planet in the Solar System has a different duration.
It depends on this the inclination of the axis of each, as well as its distance from the Sun.
But the first thing we need to know is, Why does the Earth rotate in less than 24 hours and not exactly in 24 hours?
According to the Astrohobby portal, If we observed our planet from a distant point, we would see how it specifically takes 23 hours, 56 minutes and 4 seconds to complete one revolution on itself: This is known as the sidereal period.
Since it also moves around the Sun at that time, we must wait 4 minutes for it to reach the same position with respect to the star king.
While the synodic period is the one that considers to the observer located on the Earth as reference point: there it is 24 hours in total.
And the rest of the planets? How long do they last, compared to an Earth day?
The duration of each day by planet of the Solar System
As we have said, the length of the day on each planet of the Solar System It varies depending on the inclination of its axis and its distance from the Sun.
Come on one by one:
Mercury: 58.6 Earth days. It has a very long day because it is blocked by the Sun. This means that the same side of the planet is always facing the Sun, while the other side is always in the dark.
Venus: 243 Earth days. Like Mercury, it is also blocked by the sun, but its rotation is retrograde, which means that it rotates in the opposite direction to most of the planets. This makes the day on Venus much longer than on Mercury.
Earth: 23 hours, 56 minutes and 4 seconds. It is not blocked by the Sun and its rotation is “prograde”, which means that it rotates in the same direction as most of the planets.
Mars: 24 hours, 37 minutes and 22 seconds. It has a day of length similar to that of the Earth because its rotation is also “prograde”.
Jupiter: 9 hours, 55 minutes and 30 seconds. It has a very short day because it is a giant gas planet. Jupiter’s atmosphere is very dense and heavy, which makes it spin very fast.
Saturn: 10 hours, 39 minutes and 24 seconds. It has a day length similar to that of Jupiter because it is also a giant gas planet.
Uranus: 17 hours, 14 minutes and 24 seconds. It has a very long day because it is tilted on its axis. This means that one pole of Uranus is pointing at the Sun for 42 years, while the other pole is in the dark for 42 years.
Neptune: 16 hours, 6 minutes and 36 seconds. It has a day length similar to that of Uranus because it is also tilted on its axis.