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  2. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The Jyotisha text Brahma-siddhanta, probably composed in the 5th century AD, discusses how to use the movement of planets, sun and moon to keep time and calendar. [26] This text also lists trigonometry and mathematical formulae to support its theory of orbital, predict planetary positions and calculate relative mean positions of celestial nodes ...

  3. 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.

  4. Adoption of the Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Adoption_of_the_Gregorian...

    The adopted calendar in both mainland China and Taiwan is called the Public Calendar (simplified Chinese: 公历; traditional Chinese: 公曆; pinyin: Gōnglì), or "New Calendar" (simplified Chinese: 新历; traditional Chinese: 新曆; pinyin: Xīnlì). The Chinese language may distinguish old and new style dates in different ways:

  5. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  6. 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 ...

  7. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The hourglass, invented in Europe, was one of the few reliable methods of measuring time at sea. In medieval Europe, purely mechanical clocks were developed after the invention of the bell-striking alarm, used to signal the correct time to ring monastic bells.

  8. 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]

  9. Calendar (stationery) - Wikipedia

    en.wikipedia.org/wiki/Calendar_(stationery)

    A 2007 wall calendar with moveable date marker. A calendar is used to display dates and related information, usually in a table format. Calendars are used to plan future events and keep track of appointments, and so a typical calendar will include days of the week, week numbering, months, public holidays and clock changes. [1]