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  2. Georgian calendar - Wikipedia

    en.wikipedia.org/wiki/Georgian_calendar

    The Georgian calendar (Georgian: ქართული კალენდარი) is the ancient or modern calendar of Georgia. Though Georgia now uses the modern Gregorian calendar , the old names corresponding to the months are still used.

  3. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.

  4. Prehistoric Georgia - Wikipedia

    en.wikipedia.org/wiki/Prehistoric_Georgia

    The prehistory of Georgia is the period between the first human habitation of the territory of modern-day nation of Georgia and the time when Assyrian and Urartian, and more firmly, the Classical accounts, brought the proto-Georgian tribes into the scope of recorded history.

  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. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar is the calendar used in most parts of the world. [1] [a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.

  7. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The Warren Field calendar monument is currently considered to be the oldest lunisolar calendar yet found. Mesoamericans modified their usual vigesimal (base-20) counting system when dealing with calendars to produce a 360-day year. [4]

  8. Stonehenge may have been an ancient solar calendar, a new ...

    www.aol.com/news/stonehenge-may-ancient-solar...

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  9. Timeline of Georgian history - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_Georgian_history

    A late Neolithic/Eneolithic culture that existed on the territory of present-day Georgia, Azerbaijan and the Armenian Highlands The culture is dated to mid-6th or early-5th millennia BC and is thought to be one of the earliest known Neolithic cultures. Started in c. 6000 BC and lasted till 4000 BC.