Bishop weeks dating
Many scholars proposed it had taken place in the spring, the start of the Babylonian, Chaldean and other cultures' chronologies.
These teacher training days are set at each school's discretion.
Ussher further narrowed down the date by using the Jewish calendar to establish the "first day" of creation as falling on a Sunday near the autumnal equinox.
The day of the week was a backward calculation from the six days of creation with God resting on the seventh, which in the Jewish calendar is Saturday—hence, Creation began on a Sunday.
Ussher's proposed date of 4004 BC differed little from other biblically-based estimates, such as those of Jose ben Halafta (3761 BC), Bede (3952 BC), Ussher's near-contemporary Scaliger (3949 BC), Johannes Kepler (3992 BC) or Sir Isaac Newton (c. Ussher was influenced by the same account as the apocryphal Book of Jasher, dating the worldwide flood to 2349 BC and the birth of Terah in 2127 BC.
The date of 4000 BC as the creation of Adam was at least partially influenced by the widely held belief that the Earth was approximately 5600 years old (2000 to Abraham, 2000 from Abraham to the birth of Christ, and 1600 years from Christ to Ussher), corresponding to the six days of Creation, on the grounds that "one day is with the Lord as a thousand years, and a thousand years as one day" (2 Peter 3:8).