We have actually dealt with this quite a bit. What i do know is that it was possible to pin down only several real dates before the the first centuries BC. The rest are estimates and a twenty year discrepancy is the norm.
What we did lock down was the Trojan War around 1180 BC through star positions.. Close by we had the collapse date for the global Atlantean culture in 1159 BC by tree rings. Other dates included Thera by tree rings as well and that the Great Pyramid was built be 2400 BC.
We also have the Pleistocene nonconformity which is around 12,900 BP identified as a global geological event in particular.. Eyewitness reports of the comet impact includes that of Noah and others in the Kolbrin texts. Those texts or some version succeeded in carrying the information forward until the Bronze Age at least.
Radiocarbon calibration is the big problem for Archeology. The general tree ring adjustment was a huge help but this also shows us that local variation just over the past 400 years of + 20. thus a comparable would be to look at 232 BC as potentially + 100 years for the era of Alexander.
Comparison of Radiocarbon Dates to Calendar Dates. Radiocarbon dates underestimate the actual age of the objects being dated, because the ratio of carbon-14 to carbon-12 has not been constant over time. (Source: Howard Morland/ CC BY-SA 3.0 )
"We went looking to test the assumption behind the whole field of radiocarbon dating," Manning said. "We know from atmospheric measurements over the last 50 years that radiocarbon levels vary through the year, and we also know that plants typically grow at different times in different parts of the Northern Hemisphere. So we wondered whether the radiocarbon levels relevant to dating organic material might also vary for different areas and whether this might affect archaeological dating."
Juniperus phoenicea sample from Taybet Zaman, Jordan. Credit: Sturt Manning/Cornell University
"There has been much debate for several decades among scholars arguing for different chronologies sometimes only decades to a century apart -- each with major historical implications. And yet these studies ... may all be inaccurate since they are using the wrong radiocarbon information," Manning said.
"Our work," he added, "should prompt a round of revisions and rethinking for the timeline of the archaeology and early history of the southern Levant through the early Biblical period."
The article, originally titled ‘ Inaccuracies in radiocarbon dating ’ was originally published on Science Daily.
Source: Cornell University. "Inaccuracies in radiocarbon dating." ScienceDaily. ScienceDaily, 5 June 2018. www.sciencedaily.com/releases/2018/06/180605112057.htm