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Thermolumiscence dating, on the other hand, has a unique situation.Unlike radiocarbon dates, TL dates are calculated in straight calendar years—and the dates measured range from a few years to hundreds of thousands of years.
That probably seems excessive, but it will always be useful to have a stable starting point in the past to hook our dates on, despite the outmoded religious underpinnings of our modern, multiculturally-shared calendar.
Long after the Gregorian calendar was established throughout most of the world, atomic clocks have allowed us to adjust our modern calendars with leap seconds to correct for the slowing spin of our planet and other corrections.
But, perhaps the most interesting outcome of all this investigation is the wide variety of modern mathematicians and programmers who have taken a crack at perfecting the matches between ancient calendars using modern technology.
That methodology has been refined and improved several times over the last few years.
BP was first established as a way to clarify the relationship between calendar years and radiocarbon dates.