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Day-age creationism, a type of old Earth creationism, is an interpretation of the creation accounts in Genesis. It holds that the six days referred to in the Genesis account of creation are not ordinary 24-hour days, but are much longer periods (of thousands or millions of years). The Genesis account is then reconciled with the age of the Earth. Proponents of the day-age theory can be found among both theistic evolutionists, who accept the scientific consensus on evolution, and progressive creationists, who reject it. The theories are said to be built on the understanding that the Hebrew word yom is used to refer to a time period, with a beginning and an end and not necessarily that of a 24-hour day.
The differences between the young Earth interpretation of Genesis and modern scientific theories such as Big Bang, abiogenesis, and common descent are significant. The young Earth interpretation says that everything in the universe and on Earth was created in six 24-hour days, estimated to have occurred some 6,000 years ago. Modern scientific observations, however, put the age of the universe at 13.8 billion years and the Earth at 4.6 billion years, with various forms of life, including humans, being formed gradually over time.
The day-age theory attempts to reconcile these views by believing that the creation "days" were not ordinary 24-hour days, but actually lasted for long periods of time (as day-age implies, the "days" each lasted an age). According to this view, the sequence and duration of the creation "days" may be paralleled to the scientific consensus for the age of the earth and the universe.
The Old-Earth figurative view can be traced back at least to Saint Augustine in the 5th Century who pointed out, in De Genesi ad Litteram (On the Literal [Interpretation of] Genesis) that the "days" in Genesis could not be literal days, if only because Genesis itself tells us that the sun was not made until the fourth "day".
Scottish lawyer and geologist Charles Lyell published his famous and influential work Principles of Geology in 1830–1833 which interpreted geologic change as the steady accumulation of minute changes over enormously long spans of time and that natural processes, uniformly applied over the length of that existence (uniformitarianism), could account for what men saw and studied in creation.
In the mid 19th century, American geologist Arnold Guyot sought to harmonize science and scripture by interpreting the "days" of Genesis 1 as epochs in cosmic history. Similar views were held by a protégé of Lyell, John William Dawson, who was a prominent Canadian geologist and commentator, from an orthodox perspective, on science and religion in the latter part of the 19th century. Dawson was a special creationist, but not a biblical literalist, admitting that the days of creation represented long periods of time, that the Genesis flood was only 'universal' from the narrator's limited perspective, and that it was only humanity, not the Earth itself, that was of recent creation.
American geologist and seminarian George Frederick Wright was originally a leading Christian Darwinist. However reaction against higher criticism in biblical scholarship and the influence of James Dwight Dana led him to become increasingly theologically conservative. By the first decade of the 20th century he joined forces with the emerging fundamentalist movement in advocating against evolution, penning an essay for The Fundamentals entitled "The Passing of Evolution". In these later years Wright believed that the "days" of Genesis represented geological ages and argued for the special creation of several plant and animal species "and at the same time endowed them with the marvellous capacity for variation which we know they possess." His statements on whether there had been a separate special creation of humanity were contradictory.
Probably the most famous day-age creationist was American politician, anti-evolution campaigner and Scopes Trial prosecutor William Jennings Bryan. Unlike many of his conservative followers, Bryan was not a strict biblical literalist, and had no objection to "evolution before man but for the fact that a concession as to the truth of evolution up to man furnishes our opponents with an argument which they are quick to use, namely, if evolution accounts for all the species up to man, does it not raise a presumption in behalf of evolution to include man?" He considered defining the days in Genesis 1 to be twenty-four hours to be a pro-evolution straw man argument to make attacking creationists easier, and admitted at Scopes that the world was far older than six thousand years, and that the days of creation were probably longer than twenty-four hours each.
American Baptist preacher and anti-evolution campaigner William Bell Riley, "The Grand Old Man of Fundamentalism", founder of the World Christian Fundamentals Association and of the Anti-Evolution League of America was another prominent day-age creationist in the first half of the 20th century, who defended this position in a famous debate with friend and prominent young Earth creationist Harry Rimmer.
One modern defender is astronomer Hugh Ross, who in 1994 wrote Creation and Time defending the day-age view in great detail, and who founded the day-age creationist ministry Reasons to Believe. Another person who has defended the view is Rodney Whitefield. 
Interpretation of Genesis
Day-age creationists differ from young Earth creationists in how they interpret a number of crucial Hebrew words in Genesis, and thus how they interpret the genealogies and creation account contained in it.
They point out that the Hebrew words for father ('ab) and son (ben) can also mean forefather and descendant, respectively, and that the Biblical scripture occasionally "telescopes" genealogies to emphasize the more important ancestors. This, they argue, renders genealogically-based dating of the creation, such as the Ussher chronology, to be inaccurate.
They admit that yom can mean a 24 hour solar day, but argue that it can refer to an indefinitely long period of time. It is in this sense that the word, day-age creationists say, is employed in Genesis 2:4, with a "day" of God's total creation taking place in the course of "days" of creation.
- Biblical cosmology
- Genesis creation narrative
- Genesis 1:5
- Creator god
- Dating Creation
- Timeline of the Big Bang
- Pennock(2000), p 19
- Numbers(2006), p21-23
- Numbers(2006), p33-50, 82
- Numbers(2006) p58
- Numbers(2006) p82
- Pennock(2000), p20
- About Our Founder, Reasons to Believe
- Numbers, Ronald (November 30, 2006). The Creationists: From Scientific Creationism to Intelligent Design, Expanded Edition. Harvard University Press. pp. 624 pages. ISBN 0-674-02339-0.
- Pennock, Robert T. (February 28, 2000). Tower of Babel, The Evidence against the New Creationism. The MIT Press. pp. 451 pages. ISBN 0-262-66111-X.
- Answers In Creation—Another website promoting the day-age model
- Day-Age Genesis One Interpretation—Article advocating the day-age theory
- Days of Creation—List of articles opposing the day-age theory
- Reasons To Believe—Website promoting the day-age model
- Elder, Samuel A., The God Who Makes Things Happen: Physical Reality and the Word of God, iUniverse, 2007, ISBN 0-595-42236-5 (Harmonization of the Biblical six 24-hour days of creation and the estimated 13.8 billion years observed in nature; quantum mechanics theory demonstrates God's sovereignty over chance; law of entropy identifies Jesus Christ as "anchor of time" bringing salvation "once for all").
- Ross, Hugh, A Matter of Days: Resolving a Creation Controversy, Navpress Publishing Group, 2004, ISBN 1-57683-375-5
- Sarfati, Jonathan, Refuting Compromise, Master Books, 2004, ISBN 0-89051-411-9 (YEC critique of the day-age theory and old-earth creationism)