It was a Sunday, but not just any old Sunday. This was the first one, ever. Today, we would call it the 23rd of October 4004 BC, but of course Christ had not even been born yet. This famous Sunday was the first day on Earth, the first 24 hours after God created the Earth and everything around it. It was to be a busy week ahead, culminating in the first humans, Adam and Eve, in a heavenly garden. The Following Sunday was to be a day of rest, even God needed his beauty sleep after all that.

I speak, of course, of the date that was calculated by Archbishop James Ussher (1581–1656) for God’s creation by a strict literal reading of the Bible, and especially the Book of Genesis (which you may well know has agonizingly long genealogies). Dates such as Ussher’s have been used to support creationist’s conception of the age of the Earth.

We now know, of course, that Ussher’s dates are fiction. The Earth has been dated at 4.54 Billion years, based on radiometric dating of meteorites, as well as dates on lunar and terrestrial material; quite a departure from Ussher’s calculation. The advancement of dating techniques is a marvel, and perhaps geology’s enduring contribution to science. More remarkable is how varied geochronological techniques so readily agree with each other, in another triumph of modern science.

So, in honour of the wonderful contribution of geochronology to our understanding of this fine planet, the only one we have, I would like to dedicate the 23rd of October as Geochronology Day. It is perhaps a fitting way to put all creation myths to bed, recognizing that they are only works of literature. Earth has a long and fascinating history, one worth celebrating, and it is made all the more wonderful through a deeper scientific understanding.

Viva la Science!!