The system of three 365-day years followed by one 366-day Leap Year began in 47 B.C. The extra day was added to the last month of the year, which at that time was February.=-Leapzine==For more info go to: http://www.leapyearday.com/CelebrateTheSpin.htm=
Battle of Crecy
It started in 1337.
Over 2,000.
Humans began tracking years around 5,000 years ago with the development of the ancient Egyptian calendar.
The Precambrian period was from 4600 million years ago to about 542 million years ago.
262 in leap years that begin on Monday, Tuesday, Wednesday or Thursday 261 in leap years that begin on Sunday or Friday and regular years that begin on any weekday 260 in any year that begins on a Saturday and regular years that begin on Sunday
About 500 years ago.
farming begin 10,000 to 9,000 years ago
How many years after Luther’s criticism did Galileo begin to study planets?
1985 !
2056
41 years
about 120 years ago
All years that begin on a Sunday and leap years that begin on Saturday have 53 Sundays each. All other years have 52 Sundays each.
4 Years
about a few hundred years ago
millions of years ago