January 0

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English[edit]

Proper noun[edit]

January 0

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Wikipedia

  1. December 31

Usage notes[edit]

  • January 0 refers to the day before January 1 in an annual ephemeris. It keeps the date in the year for which the ephemeris was published, thus avoiding any reference to the previous year, even though it is the same day as December 31 of the previous year.