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ECI: restore less accurate Numpy-only fallback

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@scivision scivision released this 10 May 22:25
v2.4.1
b5652b8
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Learn about vigilant mode.

v2.4.0 too boldly removed the non-AstroPy ECI conversions that only require Numpy. However, the Numpy-only fallback can have several percent error due to rotation only being considered. AstroPy considers higher-order effects that greatly increase accuracy of conversions involving ECI (eci2* or *2eci)

This release restores optional status of AstroPy for ECI, but Numpy is still required for ECI as it always has been for PyMap3d.

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