天文紀年者,紀年之法也。基於公元紀年法,但有〇年,為計算便利之故。天文學常用之,故有此名。
天文紀年無公元前後之分,但以整數示年。〇年乃公元前一年,其後則與公元同,其前則以負整數示之,如負一年乃公元前二年,與公元有一歲之差。
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