[GZG] AUs, Gravity wells and FTL: Nvermind

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As a further complication, I've seen semimajor axis as the definition, but I
gather that it's closer to the mean of the semimajor and semiminor, right?
Calculus required, which has been TOO many years, to get closer.
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Whoops, just rethought that. REALLY dumb. Please ignore!

The_Beast