How long is a year on Mercury?
One year on Mercury is 87.9691 Earth days (0.240846 Earth year).
One day on Mercury ("Mercurian day") is about 176 Earth days long. This means that one Mercurian day is twice as long as a Mercurian year.
Note: A year is the time it takes a planet to orbit the Sun. More distant planets orbit more slowly, closer planets orbit more quickly. Mercury is closer to the Sun than Earth, so its year is shorter than the Earth year. In fact, being the closest planet to the Sun, it has the shortest year of any planet in the Solar System.
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