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Don Cross a30d904b84 Improvements to Search().

Now pass in max slope of function to be searched, expressed
in units/day. By seeing how far the function is from zero,
we can deduce whether we are within the specified time tolerance
of finding the event.

Use a simplified refraction model in the rise/set search so that
the function is better fit by parabolas. Assume constant refraction
instead of variable refraction, because it only matters near the horizon
anyway. Use a canned value of +34 minutes, which creates close fit with
test data.

2019-04-22 10:43:59 -04:00