Editing 4th millennium BC (section)

==Calendars and chronology==
*'''4000 BC''' – [[epoch (reference date)|Epoch]] of the [[Freemasonry|Masonic]] calendar's [[Anno Lucis]] era.
*'''3929 BC''' – Creation according to [[John Lightfoot]] based on the Old Testament of the Bible, and often associated with the [[Ussher chronology#Lightfoot's Creation|Ussher chronology]].
*'''3761 BC''' – Since the Middle Ages (12th century), the [[Hebrew calendar]] has been based on rabbinic calculations of the year of creation from the Hebrew [[Masoretic text]] of the bible. This calendar is used within Jewish communities for religious and other purposes. The calendar's epoch, corresponding to the calculated date of the world's creation, is equivalent to sunset on the Julian proleptic calendar date 6 October 3761 BC.<ref>{{cite book |last1=Dershowitz |first1=Nachum |author1-link=Nachum Dershowitz|last2=Reingold |first2=Edward M. |author2-link=Edward M. Reingold |title=Calendrical Calculations |title-link=Calendrical Calculations |edition=1st |publisher=Cambridge University Press |year=1997 |isbn=978-0-521-56474-8 |page=11 }}</ref>
*'''3114 BC''' – One version of the [[Mayan calendar]], known as the [[Mesoamerican Long Count]], uses the epoch of 11 or 13 August 3114 BC. The Maya Long Count calendar was first used approximately 236 BC (see [[Mesoamerican Long Count calendar#Earliest Long Counts]].
*'''3102 BC''' – According to calculations of [[Aryabhata]] (6th century), the [[Hinduism|Hindu]] [[Kali Yuga]] began at midnight on 18 February 3102 BC.
*'''3102 BC''' – [[Aryabhata]] dates the events of the [[Mahabharata]] to around 3102 BC. Other estimates range from the late 4th to the mid-2nd millennium BC.