By Chris Turney (auth.)
What is the Turin Shroud? while have been the Pyramids outfitted? Why did the dinosaurs die out? How did the Earth take form? With questions like those, says Chris Turney, time is of the essence. And realizing how we pinpoint the earlier, he cautions, is important to placing the current in point of view and making plans for the future.
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Additional resources for Bones, Rocks and Stars: The Science of When Things Happened
The vernal and autumnal equinoxes are not actually fixed in time. From a northern hemisphere perspective, these equinoxes drift a few days either side of March 21 and September 23 because the year is not ~ade up of an even number of days. Anyone can notice these changes in a lifetime. Over thousands of years more significant changes take place in our planet's orbit around the Sun. Because of the gravita, tional pull on the equator by our star, the Moon, and the other planets, the Earth's rotation experiences what is commonly called a 'wobble'.
Bede implies that Ambrosius Aurelianus led the Britons to victory at a major battle called Badon, although whether he was the leader is ambiguous. Other sources suggest a different scenario. Nennius identifies Badon as one of 12 battles and links them all to Arthur: 26 BONES, ROCKS AND STARS At that time, the Saxons grew strong by virtue of their large number and increased in power in Britain. Hengist having died, however, his son Octha crossed from the northern part of Britain to the kingdom of Kent and from him are descended the kings of Kent.
Fortunately, all labs use the same half-life value. As long as we're only talking about radiocarbon, all ages are directly comparable. lc: CII ~ CII 20 3 Q. 2 The decay curve for radiocarbon Note: The shape of this curve is identical for all radioactive isotopes With radiocarbon dating, there are several important assumptions: first, we have to assume that the atmosphere has had the same 14C content in the past as today; second, all things alive have the same concentration of radiocarbon as one another and the atmosphere; and third, that no more radiocarbon is added to the sample after death.