This singularity is not understood as having a physical significance in the usual sense, but it is convenient to quote times measured "since the Big Bang" even though they do not correspond to a physically measurable time.
For example, "10 seconds ago", the precision of the meaning would be lost because the minuscule latter time interval is swamped by uncertainty in the former.
In short, Genesis was an allegory and not literal history.
The story of this great change in the conception of the history of Earth is not a simple one.
These cosmogonies were part of the new emphasis of science in seeking rational explanations of the features of the world. This period was marked by a great deal of field geology rather than grand cosmogonies.
Most of us know the name Singer but few are aware of his amazing life story, his rags to riches journey from a little runaway to one of the richest men of his age.
The story of Isaac Merritt Singer will blow your mind, his wives and lovers his castles and palaces all built on the back of one of the greatest inventions of the 19th century.
Before so-called radiometric dating, Earth's age was anybody's guess.
Our planet was pegged at a youthful few thousand years old by Bible readers (by counting all the "begats" since Adam) as late as the end of the 19th century, with physicist Lord Kelvin providing another nascent estimate of 100 million years.