systems both contain a year zero, with the astronomical year 0 corresponding to the year 1 BC, the astronomical year -1 corresponding to 2 BC, and so on.

Alternative naming systems

Informally, years may be referred to in groups based on the hundreds part of the year. In this system, the years 1900-1999 are referred to as the nineteen hundreds (1900s). Aside from English usage, this system is used in Swedish, Danish,

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