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25th century
The 25th century of the anno Domini (common) era will span from January 1, 2401– December 31, 2500 of the Gregorian calendar. It is distinct from the century known as the 2400s, which will begin on January 1, 2400 and will end on December 31, 2499.
It is going to be the last century that contains two exact square year numbers, 2401 (492) and 2500 (502). After that, square years will be more than 100 years apart, which makes it impossible to happen again.
== Astronomical predictions for the 25th century ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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