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  2. Epact - Wikipedia

    en.wikipedia.org/wiki/Epact

    A solar calendar year has 365 days (366 days in leap years).A lunar calendar year has 12 lunar months which alternate between 30 and 29 days for a total of 354 days (in leap years, one of the lunar months has a day added; since a lunar year lasts a little over ⁠354 + 1 / 3 ⁠ days, a leap year arises every second or third year rather than every fourth.)

  3. Astronomical basis of the Hindu calendar - Wikipedia

    en.wikipedia.org/wiki/Astronomical_basis_of_the...

    An animation that illustrates a geocentric model of the Solar System. The Hindu calendar is based on a geocentric model of the Solar System. [1] A geocentric model describes the Solar System as seen by an observer on the surface of the Earth. The Hindu calendar defines nine measures of time (Sanskrit: मान IAST: māna): [2] brāhma māna ...

  4. Solar calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_calendar

    The oldest solar calendars include the Julian calendar and the Coptic calendar. They both have a year of 365 days, which is extended to 366 once every four years, without exception, so have a mean year of 365.25 days. As solar calendars became more accurate, they evolved into two types.

  5. Lunisolar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunisolar_calendar

    A lunisolar calendar is a calendar in many cultures, that combines monthly lunar cycles with the solar year. As with all calendars which divide the year into months, there is an additional requirement that the year have a whole number of months (Moon cycles).

  6. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    A lunisolar calendar was found at Warren Field in Scotland and has been dated to c. 8000 BC, during the Mesolithic period. [2] [3] Some scholars argue for lunar calendars still earlier—Rappenglück in the marks on a c. 17,000 year-old cave painting at Lascaux and Marshack in the marks on a c. 27,000 year-old bone baton—but their findings remain controversial.

  7. Hindu calendar - Wikipedia

    en.wikipedia.org/wiki/Hindu_calendar

    Calendars based on solar cycle (solar months in solar year, lunar phase for religious dates but new year which falls on solar date – South and Southeast Asian solar New Year): Assamese calendar – Assam; Bengali calendar – West Bengal, Bangladesh, Tripura, Barrak Region of Assam and parts of Jharkhand. Odia calendar – Odisha

  8. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The Vikram Samvat has been used by Hindus and Sikhs. One of several regional Hindu calendars in use on the Indian subcontinent, it is based on twelve synodic lunar months and 365 solar days. The lunar year begins with the new moon of the month of Chaitra. This day, known as Chaitra Sukhladi, is a restricted (optional) holiday in India.

  9. Tropical year - Wikipedia

    en.wikipedia.org/wiki/Tropical_year

    It is a solar calendar that is designed to maintain synchrony with the mean tropical year. [34] It has a cycle of 400 years (146,097 days). Each cycle repeats the months, dates, and weekdays. The average year length is 146,097/400 = 365 + 97 ⁄ 400 = 365.2425 days per year, a close approximation to the mean tropical year of 365.2422 days. [35]

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