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  2. Astrology software - Wikipedia

    en.wikipedia.org/wiki/Astrology_software

    Software libraries exist to aid in the development of astronomical software. These libraries can also be leveraged for use in astrological projects. One such tool is Swiss Ephemeris, which is an astronomical almanac developed by Astrodienst AG, Switzerland, the makers of Astrolog. It is widely used for calculating the positions of planets ...

  3. Category:Free calendaring software - Wikipedia

    en.wikipedia.org/wiki/Category:Free_calendaring...

    Free and open-source software portal; This is a category of articles relating to calendaring software which can be freely used, copied, studied, modified, and redistributed by everyone that obtains a copy: "free software" or "open-source software".

  4. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    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 ...

  5. Astrolog - Wikipedia

    en.wikipedia.org/wiki/Astrolog

    Astrolog is an open-source astrological software program that has been available online free of charge since 1991. It has been (as of 2024) authored by Walter Pullen since its creation, and was originally distributed via postings to the Usenet newsgroup alt.astrology.

  6. Ephemeris - Wikipedia

    en.wikipedia.org/wiki/Ephemeris

    In astronomy and celestial navigation, an ephemeris (/ ɪ ˈ f ɛ m ər ɪ s /; pl. ephemerides / ˌ ɛ f ə ˈ m ɛr ɪ ˌ d iː z /; from Latin ephemeris 'diary', from Ancient Greek ἐφημερίς (ephēmerís) 'diary, journal') [1] [2] [3] is a book with tables that gives the trajectory of naturally occurring astronomical objects and artificial satellites in the sky, i.e., the position ...

  7. Wikipedia : WikiProject Calendars

    en.wikipedia.org/wiki/Wikipedia:WikiProject...

    Wikiproject Calendars compiles worldwide holidays in different calendar formats, and provides links to information on each holiday. Please feel free to add holidays ...

  8. XEphem - Wikipedia

    en.wikipedia.org/wiki/XEphem

    XEphem started as a Unix and Motif conversion of the IBM PC-based ephem.It was initially released in December 1993 with version 2.5. [citation needed] Its commercial edition was discontinued in 2016; the free version continued to be offered as proprietary software. [3]

  9. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    In a solar calendar a year approximates Earth's tropical year (that is, the time it takes for a complete cycle of seasons), traditionally used to facilitate the planning of agricultural activities. In a lunar calendar, the month approximates the cycle of the moon phase. Consecutive days may be grouped into other periods such as the week.