Calendars

*Date*	*Place*	*Event*
4500	Egypt	Egyptian calendar regulated by the sun & moon: 360 days, 12 months of 30 days each.
3760	Judea	1st year of Jewish calendar.
3372	Mayam	1st date in Mayam chronology.
2772	Egypt	Introduction of calendar of 365 days without adjustments.
2500	China	Equinoxes and solstices determined: lunar year of 360 days changes to variable sun-moon cycle.
1000	India	Lunar year has 360 days adjusted at random to coincide with solar year.
690	Assyria	Water clocks used.
500	Babylon	Astronomer Naburiannu determines length of lunar month.
46	Rome	Adoption of Julian calendar of 365.25 days; leap year introduced.