Numérotation astronomique des années
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<timefyi-glossary slug="astronomical-year-numbering"></timefyi-glossary>Définition
Un système de numérotation des années utilisé par les astronomes qui inclut une année zéro (0 apr. J.-C.) et des nombres négatifs pour les années av. J.-C. Dans ce système, 1 av. J.-C. = an 0 et 2 av. J.-C. = an -1.