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A year is the period of time it takes for a planet to complete one orbit around its star. On Earth, a year is approximately 365.25 days long.
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Astronomical Unit (AU): A unit of measurement equal to the average distance between Earth and the Sun, approximately 93 million miles.
Leap Year: A year containing an extra day (February 29) to keep the calendar year synchronized with the astronomical or seasonal year.
Sidereal Year: The time taken by Earth to orbit once around the Sun relative to fixed stars, roughly 365.25636 days.