天文学的年数計算
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<timefyi-glossary slug="astronomical-year-numbering"></timefyi-glossary>定義
天文学者が使用する年数計算体系で、年ゼロ（0年）を含み、BC年には負の数を使う。この体系ではBC1年＝年0、BC2年＝年-1となる。