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January 0

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Title: January 0  
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Subject: Ephemeris time, January, February 30, December, 0th
Collection: December, January
Publisher: World Heritage Encyclopedia

January 0

January 0 is an alternative name for December 31.


  • In an ephemeris 1
  • In software 2
  • See also 3
  • References 4

In an ephemeris

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.

January 0 also occurs in the epoch for the ephemeris second, "1900 January 0 at 12 hours ephemeris time".[1] 1900 January 0 (at Greenwich Mean Noon) was also the epoch used by Newcomb's Tables of the Sun, which became the epoch for the Dublin Julian day.[2]

In software

In Microsoft Excel, the day 0 of the 1900 date format is January 0, 1900.[3]

See also


  1. ^ "Leap Seconds". Time Service Department,  
  2. ^ ASTROCLK Astronomical Clock and Celestial Tracking Program (page 110)
  3. ^ "XL2000: Early Dates on Office Spreadsheet Component Differ from Excel".  
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