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Implement the VSOP87D position model.

Changes for 0.007 - 2024-03-31

  • Prefer Astro::Coord::ECI::Utils::gm_strftime to POSIX::strftime because the behavior of POSIX::strftime when formatting GMT changed in Perl 5.39.8, and is no longer compatible with the libc implementation, which does not alter the components given it. This requires Astro::Coord::ECI::Utils 0.131,