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Please note that a light-year is a unit of length, not a unit of time. It is the distance light travels in a year. An average value for the year is used for this purpose; thus, no distinction is made between normal and leap years. The average value, in the official definition of the light-year, is a so-called Julian year; from the Wikipedia: "In astronomy, a Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of 86,400 SI seconds each."

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12y ago

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