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Patterns in tree-ring growth can be used to establish the age of old wood samples, and also give some hints to local climatic conditions.This technique is useful to about 9, years ago for samples from the western United States using overlapping tree-ring series from living and dead wood.

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Also, some of the ancient pre-Islamic calendars in south Arabia followed a l The phantom time hypothesis is a historical conspiracy theory asserted by Heribert Illig.

Illig believed that this was achieved through the alteration, misrepresentation and forgery of documentary and physical evidence.

Like epoch, "era" in English originally meant "the starting poi A lunisolar calendar is a calendar in many cultures whose date indicates both the moon phase and the time of the solar year.

If the solar year is defined as a tropical year, then a lunisolar calendar will give an indication of the season; if it is taken as a sidereal year, then the calendar will predict the constellation near which the full moon may occur.

Fluorine has been known to form compounds with rare gases, including xenon, radon, and krypton.

Free fluorine has a characteristic pungent odor, detectable at concentrations as low as 20 ppb.Neither fluorine nor its ion, fluoride, are considered trace nutrients for human nutrition. Uses: Fluorine and its compounds are used in producing uranium.Fluorine, in the form of fluorite, is added during smelting to help reduce the melting points of metals.Comparable terms are epoch, age, period, saeculum, aeon Greek aion and Sanskrit yuga.Etymology Look up era in Wiktionary, the free dictionary.As with all calendars which divide the year into months there is an additional requirement that the year have a whole number of months.

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