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Thank you Geoffrey, that's the sort of information I really was
looking for. I was aware that deltaT is estimated from records of
historical eclipse events, but didn't have an idea on how accurate
those values would be. The paper you refer to indicates apparently
"not more than 8 minutes". Unfortunately I do at present not have
access to this article. I could however imagine that this maximal
error relates to time periods where no data are available, i.e. to
times in-between the points which were used for fitting the function.
In case some of the data points would be near the time in question,
the expected error might actually be considerably less.

Marcel

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