Which planet in our solar system has the longest day?

Venus has the longest day of all the planets in our solar system, taking approximately 243 Earth days to complete one full rotation on its axis. This is particularly interesting because a Venusian day is longer than its year, which is about 225 Earth days. The slow rotation is a result of Venus's unique axial tilt and its retrograde rotation, meaning it spins in the opposite direction to most planets in the solar system.

In comparison, Earth has a 24-hour day, Mars takes about 24.6 hours for its rotation, and Jupiter, despite being the largest planet, has a relatively short day of about 10 hours. This information highlights not only the different rotational speeds of these planets but also the distinctive nature of Venus’s day length relative to its orbital period.