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  2. Evolution of languages - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_languages

    The highly diverse Nilo-Saharan languages, first proposed as a family by Joseph Greenberg in 1963 might have originated in the Upper Paleolithic. [1] Given the presence of a tripartite number system in modern Nilo-Saharan languages, linguist N.A. Blench inferred a noun classifier in the proto-language, distributed based on water courses in the Sahara during the "wet period" of the Neolithic ...

  3. List of languages by time of extinction - Wikipedia

    en.wikipedia.org/wiki/List_of_languages_by_time...

    For many languages which have become extinct in recent centuries, attestation of usage is datable in the historical record, and sometimes the terminal speaker is identifiable. In other cases, historians and historical linguists may infer an estimated date of extinction from other events in the history of the sprachraum .

  4. Mesoamerican Long Count calendar - Wikipedia

    en.wikipedia.org/wiki/Mesoamerican_Long_Count...

    The remainder is 44.86849 years, which is 44 years and 317 days. The full year date is 644 CE. Now calculate the month and day number, taking into account leap days over the 44 years. In the Gregorian Calendar, every fourth year is a leap year with the exception of centuries not evenly divisible by 400 (e.g. 100, 200, 300).

  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. List of years - Wikipedia

    en.wikipedia.org/wiki/List_of_years

    This page is an index to individual articles for years. Years are shown in chronological order. ... 2000; 3rd millennium. 21st century. 2001; ... 50 languages ...

  7. Glottochronology - Wikipedia

    en.wikipedia.org/wiki/Glottochronology

    Glottochronology tracks language separation from thousands of years ago but many linguists are skeptical of the concept because it is more of a 'probability' rather than a 'certainty.' On the other hand, some linguists may say that glottochronology is gaining traction because of its relatedness to archaeological dates.

  8. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    This resulted in scribes and scholars referring to them as "the first month", "the fifth month", etc. [citation needed] To keep the lunar year of 354 days in step with the solar year of 365.242 days an extra month was added periodically, much like a Gregorian leap year. [10] There were no weeks in the Sumerian calendar. [11]

  9. Calendar era - Wikipedia

    en.wikipedia.org/wiki/Calendar_era

    In Korea, from 1952 until 1961 years were numbered via Dangi years, where 2333 BC was regarded as the first such year. The Assyrian calendar, introduced in the 1950s, has its era fixed at 4750 BC. The Japanese calendar dates from the accession of the current Emperor of Japan. The current emperor took the throne in May 2019, which became Reiwa 1 ...