Danh so nam thien van
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<timefyi-glossary slug="astronomical-year-numbering"></timefyi-glossary>Định nghĩa
He thong danh so nam duoc cac nha thien van su dung bao gom nam khong (0 CN) va su dung so am cho cac nam TCN. Trong he thong nay, 1 TCN = nam 0 va 2 TCN = nam -1.