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James Ussher's calculation was the best-sourced calculation in all of Christendom at the time. Ussher also spoke with authority, and from a position of authority. For those reasons, his dates for various Biblical events appeared in the margins of [[King James Version|King James]] and other Bibles for centuries, until the last quarter of the twentieth century, when publishers abandoned this practice. Sir [[Isaac Newton]] defended Ussher's date.<ref>Cited in Sarfati, Jonathan, [http://www.creationontheweb.com/content/view/141 Comets—portents of doom or indicators of youth?], ''Creation'' 25(3):36–40, June 2003.</ref>

James Ussher's calculation was the best-sourced calculation in all of Christendom at the time. Ussher also spoke with authority, and from a position of authority. For those reasons, his dates for various Biblical events appeared in the margins of [[King James Version|King James]] and other Bibles for centuries, until the last quarter of the twentieth century, when publishers abandoned this practice. Sir [[Isaac Newton]] defended Ussher's date.<ref>Cited in Sarfati, Jonathan, [http://www.creationontheweb.com/content/view/141 Comets—portents of doom or indicators of youth?], ''Creation'' 25(3):36–40, June 2003.</ref>

Another way to calculate the date of creation was [[Johannes Kepler]], who worked it out to be 3992 B.C.

[[Johannes Kepler]] also attempted to calculate the date using his own methods (sadly lost to time); he worked it out to be 3992 B.C.

Such calculations in fact date from at least the Middle Ages, and offer a range of dates from around 5000 to 4000 BC. The date used by Eastern Orthodox Christianity is often 1 September, 5509 BC. This was the date used as the beginning point for their calendars. Traditionalist Catholics often use 5199 BC. Judaic tradition reckons the date of creation at 3760 BC.  Another calculation, beginning with the date of the destruction of Jerusalem known from secular history and working backwards, arrives at 4163 BC. <ref> http://web.newsguy.com/rubyredinger/age.html Biblical age of the Earth</ref>

Such calculations in fact date from at least the Middle Ages, and offer a range of dates from around 5000 to 4000 BC. The date used by Eastern Orthodox Christianity is often 1 September, 5509 BC. This was the date used as the beginning point for their calendars. Traditionalist Catholics often use 5199 BC. Judaic tradition reckons the date of creation at 3760 BC.  Another calculation, beginning with the date of the destruction of Jerusalem known from secular history and working backwards, arrives at 4163 BC. <ref> http://web.newsguy.com/rubyredinger/age.html Biblical age of the Earth</ref>