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Astronomical year numbering

Astronomical year numbering refers to an alternative method of numbering years in relation to the Common Era. In astronomical year numbering, the year 1 BCE becomes 0, the year 2 BCE becomes -1, and in general any given year n BCE becomes -(n-1). Years CE are identical. The system is so named due to its original use by astronomers. (However, note that astronomers mostly find it convenient to use Julian dates.)

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