There are no recorded events this year. See an overview of when world history happened.
The year 6643 BC was a leap year starting on a Monday, just like 6745 BC, 6741 BC, 6737 BC, 6733 BC, 6729 BC, 6725 BC, 6721 BC, 6717 BC, 6713 BC, 6709 BC, 6705 BC, 6697 BC, 6693 BC, 6689 BC, 6685 BC, 6681 BC, 6677 BC, 6673 BC, 6669 BC, 6665 BC, 6661 BC, 6657 BC, 6653 BC, 6649 BC in the century before it and 6641 BC, 6637 BC, 6633 BC, 6629 BC, 6625 BC, 6621 BC, 6617 BC, 6613 BC, 6609 BC, 6605 BC, 6597 BC, 6593 BC, 6589 BC, 6585 BC, 6581 BC, 6577 BC, 6573 BC, 6569 BC, 6565 BC, 6561 BC, 6557 BC, 6553 BC, 6549 BC, 6545 BC in the next.
The coloured days highlight
births
,
deaths
,
political
,
scientific
,
artistic
and
other
historical milestones, and recurring events such as anniversaries and
holidays
.
The new
,
waxing
,
full
and
waning
icons indicate the phases of the moon and appear only for dates in the Gregorian calendar, i.e. after 14 October 1582. The Chinese calendar is available only from 1645 to 2644, the first millenium since the last reform. The coloured columns mark the Sundays, the last day of the week per standard ISO-8601.
The normal calendar page for the current /year?2013 contains an introduction to the intriguing history of the year as we know it. The Calendar Converter has more detail. The so called Perpetual Calendar uses a trick from before the age of computers to find the weekday for any Gregorian date. Also see an overview of all historical events in the last six thousand years.