I think SECCHI is more clever than convoluted.
How stable are the orbits of the two spacecraft? Are they locked in place relative to each other, or is it possible that over long periods of time they can drift slightly and thus not be exactly opposite the sun?
@Harlan: Kelly’s description of these as the “final” position for these orbiters was incorrect. “A”‘s orbit will stay inside earth’s orbit, so it will continue to move “ahead”, and B’s orbit is outside earth’s orbit, so it will continue to fall behind, relative to the earth’s position around the sun.
At the link in the article
showing the path from launch until now, click video #10 showing the path from now through 2019.
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