The Patriarchs are the men from whom the Hebrews and related nations descend. By some definitions this includes Isaac, Jacob, and all their sons. The stricter definition includes Abraham and his two brothers Nahor and Haran, their ancestors in the House of Shem, the three sons of Noah (Shem, Ham, and Japheth), and the ancestral line from Noah to Adam. The lives of these men form an unbroken chronological line that begins at creation and extends to the entry of Abraham into Canaan.
The year of creation is 1 AM (Anno Mundi, year of the world). James Ussher calculated the date of creation as October 23, 4004 BC. This date fell on the Sunday nearest the autumnal equinox. Pierre Simon Laplace, as quoted by Martin Anstey, observed that this date occurred in a year when the equinoxes were aligned with the major axis of the orbit of the earth around the sun.
The Biblical genealogy provides the basis for the chronology of events described in the Bible. This chronological record is precise and detailed from the first day of creation to the life of Terah, father of Abraham. From Abraham to Jesus, the dates are in dispute.
↑Anstey, Martin. The Romance of Biblical Chronology. London: Marshall Bros., 1913, pp. 48-49. Cited in Jones, Floyd N. The Chronology of the Old Testament, Green Forest, AR: Master Books, 2004 (ISBN 9780890514160), pp. 26-27
↑Note: Enoch did not die; he was translated, the first man to experience such a thing. Genesis 5:24