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A year is the time it takes for Earth to complete one full orbit around the Sun, and it serves as a fundamental unit for measuring time in our calendar systems. The exact length varies slightly depending on how it's measured—the tropical year used in our everyday calendar is approximately 365 days, 5 hours, 48 minutes, and 45 seconds, which we account for by adding leap years to keep our calendars aligned with Earth's actual position relative to the Sun.

AI-generated from the Wikipedia summary — may contain errors.