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Well executed and reported. A commercial GPS unit should put you within 10m of the stated coordinates. I'm pretty impressed that CalSky can generate a ground track of a satellite and planet to just over 2 arc minutes, with all the variables involved including accurate solution of the geoid and projection. You are probably right about needing several people to try and capture the pass across the centreline as is done with occultation observations.
Love your work.
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