The age of the earth is one of the most contentious issues in the creation/evolution debate. In today’s culture, the thought of creation occurring about 6,000 years ago is not supported.
Ussher is famous for his assertion that the universe began 4000 years before Jesus was born (4000 BCE), and then writing a 1000 page book about his belief. The book starts at Genesis 1 and uses Genesis 1 to fill in the first 2000 years. Ussher then fills in the next 2000 years using a multitude of documents. There is no tie between most of the second 2000 years and the first 2000 years, he just identifies where people wrote about “X” happening between year 1 and 2000 years ago. What Ussher is missing is the documentation between 4000 years prior to Jesus and the prior thousands of years. Such documentation leaves out those records. Pre 4000 years before Jesus: for example, by about 6000 BC, a Neolithic culture rooted in the Nile Valley. During the Neolithic era, several predynastic cultures developed independently in Upper and Lower Egypt. The Badari culture and the successor Naqada series are generally regarded as precursors to dynastic Egypt. This is all left out, and assumed never to have existed at all.
Nowhere in the Bible does it say that the day of creation was October 23, 4004. Because the Jews and many other ancient peoples started their year in the autumn, Ussher assumed there must be a good reason for it. He therefore concluded that God created the world in the autumn at an arbitrary 4000 ye