According to the passage, how is a year on Mercury defined in relation to Earth?

A year on Mercury is defined as the amount of time it takes for Mercury to complete one orbit around the Sun, which occurs in approximately 88 Earth days. This duration is significantly shorter than a year on Earth, which is about 365 days. The unique orbital characteristics of Mercury, due to its proximity to the Sun and its fast orbital speed, contribute to this shorter year. Understanding this concept is crucial for grasping how different planetary movements affect the measurement of time in comparison to Earth. Other options do not accurately reflect Mercury's orbital period in relation to Earth.