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January 0 is 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 ...
A year zero does not exist in the Anno Domini (AD) calendar year system commonly used to number years in the Gregorian calendar (nor in its predecessor, the Julian calendar); in this system, the year 1 BC is followed directly by year AD 1 (which is the year of the epoch of the era).
No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.
An impression has sometimes arisen that ephemeris time was in use from 1900: this probably arose because ET, though proposed and adopted in the period 1948–1952, was defined in detail using formulae that made retrospective use of the epoch date of 1900 January 0 and of Newcomb's Tables of the Sun. [5] [6]
The calendar begins counting from 1 January 1166 BC in the Discordian year 0, ostensibly the date of origin of the Curse of Greyface. An alternate designation, A.D.D. has been occasionally seen (Anno Domina Discordia, a Latin translation of YOLD, but presumably also a play on attention deficit disorder). [citation needed] e.v. – Era vulgaris ...
January 15 to 23: International Snowmobile Safety Week. January 30 to February 6: National Storytelling Week. Monthly Observances in January 2024. Be Kind To Food Servers Month.
January is the least favorite month for 31% of Americans. In addition to January feeling like it was six months long − a popular sentiment shared on TikTok − a good amount of people just don't ...
January 31. Backward Day. Inspire Your Heart With Art Day. Week-Long Observances. Good Housekeeping. Diet Resolution Week – First Week. National Silent Record Week – First Week.