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  2. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    Companies in Europe often use year, week number, and day for planning purposes. So, for example, an event in a project can happen on w43 (week 43) or w43-1 (Monday, week 43) or, if the year needs to be indicated, on w0643 (the year 2006, week 43; i.e., Monday 23 October–Sunday 29 October 2006). An ISO week-numbering year has 52 or 53 full ...

  3. Calendrical Calculations - Wikipedia

    en.wikipedia.org/wiki/Calendrical_Calculations

    The authors design individual calendrical calculation algorithms for converting each of these calendars to and from a common format, the Rata Die system of days numbered from January 1 of the (fictional) Gregorian year 1. Combining these methods allows the conversion between any two of the calendars.

  4. Astronomical Almanac - Wikipedia

    en.wikipedia.org/wiki/Astronomical_Almanac

    The Astronomical Almanac [1] is an almanac published by the United Kingdom Hydrographic Office; it also includes data supplied by many scientists from around the world.On page vii, the listed major contributors to its various Sections are: H.M Nautical Almanac Office, United Kingdom Hydrographic Office; the Nautical Almanac Office, United States Naval Observatory; the Jet Propulsion Laboratory ...

  5. Jet Propulsion Laboratory Development Ephemeris - Wikipedia

    en.wikipedia.org/wiki/Jet_Propulsion_Laboratory...

    The Astronomical Almanac for 1984 through 2002 were based on JPL ephemeris DE200, and from 2003 to 2014 the Astronomical Almanac was based on JPL ephemeris DE405. [9] As of 2022, the Almanac is derived from DE430. [15] The JPL ephemerides are widely used for planetary science; some examples are included in the Notes and References.

  6. SoCal stargazers, mark your calendars for top astronomical ...

    www.aol.com/news/socal-stargazers-mark-calendars...

    The Los Angeles Astronomical Society is hosting a star party that's equipped with professional telescopes at the lawn area in front of the Griffith Observatory's main entrance Jan. 4, for example.

  7. Computus clock - Wikipedia

    en.wikipedia.org/wiki/Computus_clock

    The movement of a computus clock provides and/or calculates astronomical and calendar information according to the tradition that Easter Sunday is the first Sunday after the first full moon (Paschal or ecclesiastical full moon) on or after the spring equinox (21 March), and Easter Sunday should not occur on the same day as the Jewish calendar date Nisan 15th, the first day of Passover week.

  8. Astronomical year numbering - Wikipedia

    en.wikipedia.org/wiki/Astronomical_year_numbering

    There is a disagreement between astronomers and historians about how to count the years preceding year 1. In [Astronomical Algorithms], the 'B.C.' years are counted astronomically. Thus, the year before the year +1 is the year zero, and the year preceding the latter is the year −1. The year which historians call 585 B.C. is actually the year ...

  9. List of almanacs - Wikipedia

    en.wikipedia.org/wiki/List_of_almanacs

    Download as PDF; Printable version; In other projects ... Kalnirnay – the world's largest yearly published almanac (1973–present) [2] ... Astronomical Phenomena ...

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