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eci: use AstroPy

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@scivision scivision released this 23 Apr 20:46
v2.4.0
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The ECI calculation error was substantial for some applications due to only considering Earth rotation. Now ECI calculations use AstroPy for better accuracy (< 1% error) considering more factors in the ECI transformations.
Fixes #33

Added geodetic2eci

Added more ECI self-tests

Temporarily pinned CI to Python 3.8 to avoid the usual issues with brand new Python releases not immediately having PyPi wheels for Astropy. We still also test Python 3.5.

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