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The Greeks consider the first Olympic Games as the beginning or 776 BC.
The Muslims count the Prophet’s departure from Mecca, or the Hegira, as their beginning at AD 662.
There are two techniques for dating in archaeological sites: relative and absolute dating.
Relative dating stems from the idea that something is younger or older relative to something else.
Artefacts and features show three-dimensional attributes: time, space and form. The Mayan calendar used 3114 BC as their reference.More recently is the radiocarbon date of 1950 AD or before present, BP.When scientists are able to determine the age of rocks and fossils, they can then tell a more accurate story of the Earths history.When Geologists and other scientists refer to the age of the Earth, they are using one of two methods to determine this.