Vì sao năm 2006 lại là năm nhuận?
Một số bạn đọc thắc mắc: Năm 1998 nhuận, năm 2001 nhuận và năm 2004 cũng nhuận. Như vậy, quy luật là cứ 3 năm nhuận một lần. Vậy, vì sao năm nay 2006, mới 2 năm đã nhuận?
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