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  2. Christopher Clavius - Wikipedia

    en.wikipedia.org/wiki/Christopher_Clavius

    Christopher Clavius, SJ (25 March 1538 – 6 February 1612 [1]) was a Jesuit German mathematician, head of mathematicians at the Collegio Romano, and astronomer who was a member of the Vatican commission that accepted the proposed calendar invented by Aloysius Lilius, that is known as the Gregorian calendar. Clavius would later write defences ...

  3. Calendar reform - Wikipedia

    en.wikipedia.org/wiki/Calendar_reform

    The International Fixed Calendar is a more modern descendant of this calendar: invented by Moses B. Cotsworth and financially backed by George Eastman. [8] Around 1930, one James Colligan invented the Pax Calendar, which avoids off-calendar days by adding a 7-day leap week to the 364-day common year for 71 out of 400 years.

  4. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    Calendars in antiquity were usually lunisolar, depending on the introduction of intercalary months to align the solar and the lunar years. This was mostly based on observation, but there may have been early attempts to model the pattern of intercalation algorithmically, as evidenced in the fragmentary 2nd-century Coligny calendar. Nevertheless ...

  5. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  6. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    An arithmetic calendar is one that is based on a strict set of rules; an example is the current Jewish calendar. Such a calendar is also referred to as a rule-based calendar. The advantage of such a calendar is the ease of calculating when a particular date occurs. The disadvantage is imperfect accuracy.

  7. Calendar call - Wikipedia

    en.wikipedia.org/wiki/Calendar_call

    A calendar call is an occasion where a court requires attorneys representing different matters to appear before the court so that trials and other proceedings before the court can be scheduled so as not to conflict with one another. [1]

  8. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The International Fixed Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal) [1] was a proposed reform of the Gregorian calendar designed by Moses B. Cotsworth, first presented in 1902. [2] The International Fixed Calendar divides the year into 13 months of 28 days each.

  9. Google Calendar - Wikipedia

    en.wikipedia.org/wiki/Google_Calendar

    Google Calendar is a time-management and scheduling calendar service developed by Google.It was created by Mike Samuel as part of his 20% project at Google. [5] [6] It became available in beta release April 13, 2006, and in general release in July 2009, on the web and as mobile apps for the Android and iOS platforms.