What is the rotational period of Mercury?

The rotational period of Mercury, which refers to the time it takes for the planet to complete one full rotation on its axis, is approximately 59 Earth days. This slow rotation is significant in contrast to its orbital period around the Sun, which is about 88 Earth days. This unique ratio results in a phenomenon where a day on Mercury (the time from one sunrise to the next) is much longer than its year.

Understanding Mercury's rotation helps illustrate its extreme environmental conditions, as the planets closer to the Sun experience significant temperature variations between day and night. This slow rotation contributes to Mercury having one of the longest days in the solar system compared to its quick orbit around the Sun. The distinction between the rotational period and other options emphasizes the unique characteristics of Mercury in its relationship with solar energy.